How do I know if someone is right for me?

You know someone might be right for you by watching how you feel and who you are around them across ordinary weeks, not by how well they match a list. After a few years of dating, you already know what wears well and what doesn’t. The work is less about finding a sign and more about trusting what you’ve seen.

What actually predicts whether it works?

Mostly what happens between the two of you, not who each of you is on paper. In a 2020 project, Samantha Joel and colleagues pooled 43 long-term couples studies from 29 labs and used machine learning to find what best predicted relationship quality.1 The strongest predictors were about the relationship itself: feeling that your partner is committed, feeling appreciated, sexual satisfaction, sensing that your partner is happy, and how much conflict there is.1 Those relationship perceptions explained up to 45% of the differences in quality at the start of the studies.1

And here’s the part for you: a person’s own perceptions predicted two to four times more than their partner’s reports did.1 Your experience of the relationship is the main data.

Farah, 32, is about to host her first dinner party in the apartment she just bought. Julian, 36, a set designer she’s been seeing for six weeks, asked if he could come. He’s warm, he remembers things, he always confirms plans. And Farah keeps waiting for the jolt she felt with the last two people, both of whom were gone within three months.

• What happened: six weeks of plans that happened, one real question about meeting her friends.
• The reading: if it’s right, shouldn’t it feel more electric?
• The fear: that she’s misreading again, in one direction or the other.
• The next step: let him come Saturday and pay attention to how it feels.

Can you trust your gut about someone?

More than your doubts suggest. In a four-year study of 135 newlywed couples, James McNulty, Michael Olson and colleagues measured gut-level attitudes toward a spouse with a quick reaction-time task.2 Those automatic feelings predicted how satisfied people stayed over time. What people consciously said about their marriage did not.2

That’s newlyweds, not six weeks in. But it suggests something useful: your quiet, immediate sense of someone carries information, sometimes more than the version you argue yourself into. Farah’s gut doesn’t feel dizzy around Julian. It feels at ease. Both are reactions worth listening to.

Why doesn’t the list help more?

Because what you say you want and who you actually enjoy aren’t the same thing. In a 2014 review, Paul Eastwick, Laura Luchies, Eli Finkel and Lucy Hunt found that single people’s stated preferences predicted who they’d like on paper but not who they were drawn to after meeting in person.3 Once people were together, though, seeing their partner as close to their ideals did go with more satisfaction.3

So the list isn’t useless. It’s just better at describing a good relationship after you’re in one than at picking someone out before you are.

What counts as a real sign?

Look for things you could point to, over a few weeks:

• Initiative. They suggest plans, not just agree to yours.
• Follow-through. The small promises happen, without reminders.
• Curiosity. They ask about your work, your friends, the thing you mentioned last week.
• Warmth in person. Texts are nice; how they treat you across a table matters more.
• Ease. You don’t rehearse before you see them, and you don’t need a day to recover after.
• How you are around them. You like the version of yourself that shows up.

Steadiness over sparkle. It’s quieter than someone who texts you paragraphs at 2 a.m., and it tends to wear better.

What if you can’t stop second-guessing?

A little doubt is part of liking someone. But if you find yourself constantly checking whether your feelings are strong enough, comparing every moment to a feeling you think you should have, and asking friends for reassurance on a loop, that can become its own problem. Guy Doron, Danny Derby and colleagues have studied this pattern, often called relationship obsessive-compulsive disorder, centered on doubts about your feelings, their feelings and whether the relationship is “right,” and they link it to lower mood and strain.4 Only a qualified professional can say whether that term applies. If the doubt is persistent or upsetting enough to spill into your work or sleep, a licensed mental-health professional is the right help.

What should you do this week?

• Invite them into an ordinary part of your life. A dinner with friends, an errand, a slow Sunday. You learn more there than at another great date.
• Write down what they’ve done, not said. Three lines after each plan.
• Check the morning after. Calm and glad is a good sign. Wired and anxious is worth noticing, whichever way it points.
• Say what you’d like. If you want more time, more plans or more clarity, ask plainly.
• Let your read count. You’ve dated enough to know things. Use them.

What doesn’t the research show?

• The 43-study project looked at couples already together, often for a while. It tells you what matters in a relationship, not how to pick one early.1
• The gut-feeling study was with newlyweds and used a lab measure, not a feeling you can introspect on demand.2
• The preferences review focused on early attraction. It doesn’t mean values and standards stop mattering.3
• No study can tell you whether one particular person is right. What the research supports is paying attention to how the relationship actually feels over time.