With more than 7 billion people in the world, how can you be sure the person you're with is "The One"? Sadly, there's no litmus test or Internet quiz that'll give you the answer to that one.
But for some, there's a moment in the relationship when it just dawns on them.
Married men used the Whisper app to anonymously share what these moments were like for them. Each "sign" described is completely different, and illustrates that every relationship is unique and there's no tell-tale way to know it's right until you just know.
You can read some of their confessions below: