The wedding vows that moved 8.8 million people, and what science says about couples who last

There were no fireworks and no surprise dance routine. Just a Paraguayan couple standing in front of their guests, reading the vows they had written for each other. The video, posted on TikTok, passed 8.8 million views and thousands of comments along the lines of "I'm not crying, there's something in my eye". Why does something so simple move us so much?

Part of the answer lies in what they said. Instead of grand promises, they talked about small, concrete things: being there on bad days, choosing each other even when it's hard, laughing together. And that turns out to match a lot of what science has learned about couples who last.

What the research says: it's not magic, it's habits

Psychologist John Gottman, who spent more than four decades observing thousands of couples in his "love lab" at the University of Washington, reached a surprisingly everyday conclusion: stable relationships aren't built on grand gestures but on thousands of small interactions.

1. Responding to "bids" for connection

Gottman called them bids: the small attempts we make to get our partner's attention, like "look at that bird" or "did you see what happened today?". In his study of newlyweds, couples still together six years later had responded to those bids about 86% of the time; those who split up, around 33%. Turning toward your partner, even with a simple "really? tell me more", matters more than it seems.

2. Five to one

Another widely cited idea from his work: in stable couples, during conflict, there are roughly five positive interactions for every negative one (a joke, a sign of interest, a gesture of affection). It doesn't mean they never argue; it means affection outweighs tension.

3. The "four horsemen"

Gottman identified four behaviors that predict serious trouble: criticism of character (rather than of a behavior), contempt (sarcasm, mockery, eye-rolling), defensiveness and stonewalling (shutting down and refusing to engage). Of these, contempt is the most damaging.

What else helps

• Knowing your partner's world: what worries them, who their friends are, what they dream about. Gottman calls these "love maps".
• Expressed gratitude: research from the University of Georgia linked feeling appreciated by a partner with greater stability, even during financial stress.
• Celebrating good news: psychologist Shelly Gable showed that how we react when something good happens to our partner (with genuine enthusiasm, not indifference) matters as much as supporting them through bad times.
• Shared novelty: doing new things together, even simple ones, is associated with greater satisfaction in long relationships.

Why personal vows hit so hard

Vows written by the couple themselves work like a "love map" read out loud. They mention details only the two of them know, letting us glimpse a real intimacy. And at a time when social media is full of polished, produced content, authenticity stands out and is deeply welcome.

How to write your own vows (or a letter to your partner)

You don't have to be getting married to do this. Many couples renew their promises on an anniversary or simply write each other a letter. A few ideas:

1. Start with a specific memory: the day you knew they were the one.
2. Name what you admire: not just what they give you, but who they are.
3. Make realistic promises: "I'll make your coffee on Mondays" can be more powerful than "I'll give you the moon".
4. Include the hard days: acknowledging that there will be problems and that you want to face them together is a mature promise.
5. End with something only the two of you understand: an inside joke, a song, a word.
6. Keep it short: one to two minutes read aloud is plenty.

An important note

No relationship is perfect, and the research is also clear about one thing: love shouldn't hurt. If a relationship involves control, humiliation, threats or any form of violence, the answer isn't "better communication" but getting help. Most countries have free, confidential helplines; in the US, the National Domestic Violence Hotline is 1-800-799-7233.

The real secret

The video from Paraguay reminded us of something scientists have been measuring for years: lasting love looks less like a movie and more like a habit. A look when the other person is talking, a "thank you" for something small, an apology at the right moment. Simple things, repeated for years. Maybe that's why they move us so much: anyone can start practicing them today.