I saw the girl who was my only semi long-term relationship got married after a year of dating.
I cared about her a lot, more than a should of though at least part of that was due to her being one of the few women actually liked me(for a while anyway).
It's kind of fucked me up.

First-light 2 2h ago
If you haven't marred before, you can tend to look at marriage as something solid or as sort of portal to full adulthood that you are on one side of and the grown ups have passed through. The only way marriage actually makes you feel any different is that you are fucked financially if you quit, so you can feel less secure. That's all. Other than that its just a big party for women to show off at followed by wearing a ring to say you had a big party once. But you aren't really a bit different.
All it means is she had a big party with Beta. Be grateful it wasn't you she talked into signing that contract with the state that says she can have your shit if she stops loving you.
I know it can be hard feeling you missed out and another guy got something you wanted but try to see that all he has got is uncertainty now. He can't get more married now. The only way is down. Its now a case of keep her satisfied or pay the price. Marriage doesn't even make her less available to other men or bring her back if she runs away. It is only a minus for a man.
In my case I never felt any distress when my ex wife re-married. I was grateful to Beta that he had signed on to raise my kids (I had already accepted that I wouldn't be seeing them again thanks to my ex's obstruction) I thought "Rather Beta than me" I divorced her at 24. I am sorry to say that by then she had already peaked physically. She was already by then a little fatter than ideal. Beta has to carry her all the way down hill. Right now I think Beta (assuming he is still serving his life sentence, I never check up) has a 40 something post wall whale on his hands and if not already he will soon will be starting to deal with the perimenopause. (She never was too good on the anger issues pre wall....) I know I got the better deal, even if it cost me all I had and then a huge loan just to keep my house.
Just relax. The picture only looks sweeter every year.
cundardunfinished 2h ago
First you should avoid this information to the extent possible. Don't stay connected with exes on social media if it bothers you or if that's how you're finding out. It's like picking a wound it isn't helpful.
Second, as you get older you realize you didn't miss out on anything with your exes. They get older and fatter and you bang women younger and fitter.
Lastly, GFTOW