The Science of Love: From Instant Chemistry to Lasting Connection

When you know what love is, it’s easier to find.

You have to love well in order to live well.

I’m sure you agree. But that sentiment puts a lot of pressure on the word “love.”

Love. There’s nothing we want more, yet have a harder time recognizing when we truly find it. It’s the stuff of sweet poems, sappy love letters, and laboriously crafted 90’s mix tapes. Everyone wants to fall in love…and for good reason. It’s like nothing else.

Finding something that amazing is too important to leave to chance. But knowing what to look for and knowing what you have once you’ve found it, is harder than it seems.

That’s because all love isn’t the same.

What Is Love? (Baby Don’t Hurt Me)

Love comes in two powerful forms. One ignites like fireworks, the other simmers like a cozy campfire.

Passionate love is where butterflies are born. It’s thrilling, intense, consuming, and often feels irresistible. You want your partner physically, emotionally, and mentally. Passionate love is full of sexual excitement, mental obsession, and idealization. Passionate love also makes us blind, deaf, and a little dumb.

Those fairytale feelings can make you obsessed, blind to red flags, and so high on the “idea” of someone that your brain skips a proper cost-benefit analysis. It's all gas, no brakes. Passionate love is fun and exhilarating while it lasts, but difficult to sustain long-term. Much like those sparklers you light on the beach, passionate love sizzles brightly but can fizzle out fast.

In contrast, companionate love is that long-lasting warmth, a trusting, affectionate, and deeply rooted bond built on genuine friendship. Picture an older couple who still make coffee for each other on Sunday mornings, laugh about crumbs in the butter, and hold hands like teenagers. Companionate or friendship-based love might not sweep you off your feet, but it’s the kind that holds you steady.

As a professor, I'm not a fan of having students copy material word for word. However I do make one exception, this definition of friendship-based love (Grote & Frieze, 1994):

“comfortable, affectionate, trusting love for a likable partner, based on a deep sense of friendship and involving companionship and the enjoyment of common activities, mutual interests, and shared laughter “

I have students write this in their notes, because this definition describes the forgotten and neglected form of love. Though often overlooked in relationship science and in articles like this, research confirms that people prefer the “friends first" path to relationship initiation (Stinson et al., 2022). And they should.

A study of 622 married individuals found that those with more friendship-based love reported that their relationship was more important to them, that they felt closer to their spouse, and that they had more respect for their partner (Grote & Frieze, 1994).

Sure, companionate love facilitates satisfaction, but what about the sparks? Can it help in the bedroom? A study of nearly 400 people found that those who valued their friendship with their partner more, felt more in love, more committed, and had greater sexual gratification (Vanderdrift et al., 2013). An added bonus: they were less likely to break-up. You have to love hearing that.

When researchers asked “expert couples” (those who have been happily married for over 15 years) what the secret was to their success, their responses were revealing (Lauer & Lauer, 1985). Reason number one? “My partner is my best friend.” Reason number two? “I like my spouse as a person.” It all sounds so simple.

The love that gets you down the aisle,

isn’t the same that gets you to your 50^th anniversary.

What gets you together as a couple, isn’t the same thing that keeps your relationship going strong. (If you think about it, there’s a lesson in there for dating.)

But it’s a bit tricky. If you focus too much on optimizing for passionate love, you can habituate to the excitement, feel like you’ve fallen out of love, and realize you lack the emotional intimacy necessary to carry the relationship forward. However, if you neglect passion, you can end up with a pal instead of a partner. That’s a problem when what you want is a romance, not a roommate. Ultimately, you need to strike a balance. While passionate love may spark the flame, it’s companionate love that keeps the fire burning strong.

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Does Love Conquer All?

Our relationship partners aren’t perfect. In fact, research shows that thinking of a relationship partners often conjures up both positive and negative feelings (Zayas & Shona, 2015). In other words, we often have a bit of a love-hate relationship with our loved one. They’re not perfect (that’s ok, we’re not either).

When our love life isn’t perfectly lovable, we often rely on the romantic notion that all we need is love. Though that sounds sweet, it isn’t entirely true. Feeling in love with our partner is only one piece of what makes a relationship work.

Harsh Truth: The person you love, may not be good for you.

A successful loving relationship has several important qualities (pictured below) such as trust, open communication, respect, predictability and authenticity. A partner who truly loves you will have these qualities and won’t try to change you, be demanding, threatening, selfish, controlling, isolating, disrespectful, mean, manipulative, or abusive.

Someone who truly “loves” you should also show these other qualities.

Be careful. Don’t fall for the, “But, I love you” that’s designed to excuse all forms of bad behaviors. An “I love you” is cheap. Saying the words “I love you” is the easiest way for the disingenuous and deceitful to build unearned connection. Love isn’t something you just say. It’s how you act and feel. It’s your motivation to care for and support your partner. It’s something you embody in your day-to-day interactions.

Love isn’t something you fall into. It’s something you grow together.

Who Is Most Likely to Fall in Love with the Wrong Person?

If you’re someone who falls in love fast and often, you might be setting yourself up to fall for the wrong kind of partner. Research shows that people high in emophilia, a strong tendency to fall in love quickly (e.g., “I tend to jump into relationships,” “I fall in love easily,” etc.), found individuals with Dark Triad traits like narcissism, psychopathy, and Machiavellianism more appealing (Lechuga & Jones, 2015). In fact, the more Dark Triad traits a partner possessed, the more ideal they seemed to those who love to fall in love.

Though the “Dark Triad” sounds bad (it is), these partners are charming, charismatic, confident, and sociable. That’s dangerous, because those are all great qualities… at first. Dark Triad partners are also manipulative, entitled, or even hostile. These dark tendencies often surface later after you’ve fallen for them, leading to heartache. Falling in love isn’t the problem. It can be hard to see at first. However, falling too easily can blind you to red flags. You need to know what love really looks like.

Know What You’re Seeing

• Don’t mistake control for love.

• Don’t mistake jealousy for love.

• Don’t mistake obsession for love.

• Don’t mistake insecurity for love.

• Don’t mistake lust for love.

• Don’t mistake empty words for love.

• Don’t mistake grand gestures for love.

• Love isn’t longing for someone. It’s the sense of security in knowing they’ll always be there.

• What kind of love are you chasing? The love that gets you excited and gives you attention or the love that helps you feel safe and authentic?

Conclusion

Instant chemistry may spark attraction, but it’s emotional depth that transforms it into lasting connection. Real love isn’t something we stumble into—it’s something we build with intention, trust, and time. Moment by moment, choice by choice, we create the kind of love that endures.

Please share the love. Do you know someone who loves psychology and/or relationships? Sharing shows the love.

Here’s what you can look forward to:

The Psychology of Relationships 101 Curriculum

1. Is It Just Me? Or, Is This How Relationships Are?

2. Clarity Attracts Chemistry: The Power of Knowing Who You Are

3. The Flirting Formula: Science-Backed Strategies for Connection

4. The Science of Attraction: It’s Not Just Looks, It’s Psychology

5. The Science of Love: From Instant Chemistry to Lasting Connection

6. The Truth about Attachment: The Science of Secure Connection

7. Sex Ed 2.0: The Conversations We Missed

8. The Science of Communication: What Builds Connection and What Breaks It

9. When the Spark Fades: Feeling Adrift in Love

10. The Erosion of Intimacy: Dealing with the Dark Side of Relationships

11. Happily Ever After or Single Again: Does My Relationship Have a Future?

12. The Foundation of Forever: Simple Strategies for Enduring Connection

13. Break Up Doesn’t Have to Leave You Broken

14. The Connection Code: Your Keys to Unlocking a Love That Lasts

References

Grote, N. K., & Frieze, I. H. (1994). The measurement of friendship-based love in intimate relationships. Personal Relationships, 1(3), 275-300. doi:10.1111/j.1475-6811.1994.tb00066.x

Lauer, J. & Lauer, R. (1985). Marriages made to last. Psychology Today, 85, 22-26.

Lechuga, J., & Jones, D. N. (2021). Emophilia and other predictors of attraction to individuals with Dark Triad traits. Personality and Individual Differences, 168, Article 110318. https://doi.org/10.1016/j.paid.2020.110318

Stinson, D. A., Cameron, J. J., & Hoplock, L. B. (2022). The Friends-to-Lovers Pathway to Romance: Prevalent, Preferred, and Overlooked by Science. Social psychological and personality science, 13(2), 562–571. https://doi.org/10.1177/19485506211026992

VanderDrift, L. E., Wilson, J. E., & Agnew, C. R. (2013). On the benefits of valuing being friends for nonmarital romantic partners. Journal of Social and Personal Relationships, 30(1), 115-131. doi:10.1177/0265407512453009

Zayas, V., & Shoda, Y. (2015). Love you? Hate you? Maybe it’s both: Evidence that significant others trigger bivalent-priming. Social Psychological and Personality Science, 6(1), 56–64. https://doi.org/10.1177/1948550614541297