How is my ex boyfriend getting married after only knowing this girl for 4 months?

I dated a guy for over 2 years and broke up with him last year, it was for various reasons such as hardly ever seeing him. It's funny because we dated for so long and he wanted to wait to get married, we talked about it all the time but he never asked and he never put me first in the relationship. Video games were always more important, he was a nice guy just not very social, very closed in type. Recently I found out that he's getting married in 2 months after only knowing the girl for 4. He's apparently totally changed, he always puts he first, wanted to marry her only 2 weeks of dating her (it took him 6 months to tell me he loved me). He's super social now, hardly plays video games anymore, doesn't even have a computer at his place. He made my life such a living hell when I broke up with him, threatened to kill himself, and after couple of months told me that he couldn't talk to me anymore because he was still in love with me and couldn't get over me. I guess I'm just confused that if he was so in love with me how could he fall in love with someone else, completed change who he was and marry her so soon?
Updates:
+1 y
Thanks for the responses guys, it did help. I'm in a bit of tough spot right now with his fiancee wanting to be friends and I have no idea how to deal with it. He dislikes me and she wants to be friends with me? How does that work? I don't think it will!
+1 y
Well to be honest I was excited for him when I found out he was engaged, I do want him to be happy and his soon to be wife is a really nice girl. But he flat out rude to me still and wants nothing to do with me. But still his fiance wants to be friends?
How is my ex boyfriend getting married after only knowing this girl for 4 months?
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