To be fair, maybe he didn’t want to get married and have kids with you. This is not a knock on you OP, just people can and do change their minds over time. I’m sure you are a decent person, just to your ex, you were not “the one” like his current wife is.

Maybe the new wife is awesome. You could still be pretty good. Maybe even doable...

Honestly as much as it sucks many of the platitudes have a hidden “with you,” stuck on the end. I’m not ready for a relationship (with you). I don’t want kids (with you). I’m not ready to get married (to you.) It’s an unfortunate part of dating - rejection happens. And people lie about it to cushion the blow. We constantly hear about he (or she) broke up with me because he wasn’t ready for long term commitment, and 6 months later they’re engaged. When it clicks it clicks, and when it doesn’t there’s no use beating yourself up about it. It sucks, and that’s life. And honestly I don’t see it being any better if at the end of each relationship of a few weeks to a few years the answer was “well, I came to realize you kind of suck, and aren’t really my type after all, so bye and have a good life, I’m going to find someone who is more _____ than you are.”

very good possibility he accidentally got his jump off pregnant.

Sorry for what? You would have wanted to be with someone and having kids and getting married if you were not right for him? So you would have been in a miserable marriage teaching your children that only important thing is to be with someone no matter what, or you would have preferred to be divorced and single mother sharing custody?? People do and can change their mind, and if there is something that makes you not sure you should always move on. Relationships, family and marriage cannot be forced. Be happy that he found someone he seems comfortable with, and maybe concentrate on yourself why do you feel like you missed out? Were you really so in love with him that you saw future together? Why did you break up? Ask yourself maybe you weren't right because after years you still cannot let go and be happy for someone, rather you're hurt, and sorry that you're not enough. That is more concerning, where's your value? Self respect? Self love? Comparing yourself to ex new partners is toxic and mainly you make yourself miserable when living in past. Life will go on, with or without you. Every relationship gives us an experience or a lesson, i personally broke off my engagement 3months before wedding that was planned and paid for because he said something that didn't sit well with me "when we get married you will stay at home with children" I was second year student, I came home told my mum, cried and broke it off next day. Three years it was perfection, and then this one sentence made me cancel. No regrets, it was the right decision and best one for me.

Yeah, he just didn't want marriage and kids with YOU. Sorry about that. For his wife's and kid's sakes, I hope he sticks around.

Don't look at it as not good enough, but rather not fitting enough. You'll find the one to be with as well. Give it time