Yeah, kinda. The guy I went out with at uni before DH. He was part of the same friend group, but a bit older than me, he'd had a GF through uni and it had ended badly. He didn't want to commit, wanted to move abroad, and I was still studying for another couple of years. I ended it, because he kept saying don't catch feelings, I'm planning to move away, things like that. I took him at his word and decided to end it before I got hurt. We stayed friendly, but at a distance. He got married to someone in a different country and now lives there. I have kids, he doesn't.
He got married to a younger woman from a rich, privileged background who sounds rather spoilt, entitled and high maintenance. This isn't me believing the poor unhappily married man spiel, btw, I'm very wise to that shite - more what I've heard from mutual friends, and I met her once at a friend's wedding. She got drunk and said she knows he regrets not ending up with me, it was all a bit awkward! I just brushed it off, said oh we were young, it was ages ago, I'm sure that's not true, that type of thing. I don't hear much from him for another few years, then around 3 years ago, he visited the UK and came up to the city nearest to where I now live and invited me for a coffee. I thought OK, nice to meet up and have a catch up after all these years. Then he tells me he absolutely adored me and was devastated when I ended it, I'm his one that got away, he's never had a connection like it since with anyone, even his wife. You could have knocked me down with a bloody feather! I hadn't a clue he felt like that, as when we were together, he pushed me away.
He's still hot, even at 50, and I do occasionally wonder what might have been, but I think I'm definitely more happily married than he is. Pretty sure if his marriage was going well, he wouldn't be hitting up an ex from nearly 20 years ago! He does try and slide in my DMs every so often and try it on - I just tell him not to be so bloody daft. I feel sorry for his wife, and also kinda sad for him too. I did always wish him well, and wanted him to be happy even if we didn't end up together. Brings me no pleasure to see that he is miserable and unhappily married. He didn't get to become a dad either because his wife would only consider surrogacy (culturally common where they live for rich people) and he refused to do it. But the answer to an unhappy life isn't romanticising the past. For whatever reason, as miserable as he says the marriage is, he's still in it, so ya know - take responsibility!