Why am I like this?

So me and this girl ended up liking each other in the past and it didn’t work out because I mentally felt played and unwanted because she spent so much time with her guy friend than me. I tried to talk about it and call her out on it but she blocked me for awhile. So then she kept asking for me back and how sorry she was for months and I caved in finally and we said we’d work on being just friends and that she cut that dude off. Things were fine we set boundaries to slowly build a friendship again and it was working but the other day she said she talked to that same guy friend again and apologized to me about it. I tried being cool and not a controlling person and said it’s okay to talk to him it is what it is but it’s killing me inside like why can’t I stop overthinking it? why can’t I let it go? I don’t want to be that jealous guy and tell her she can’t talk to him since we’re just friends but after he got brought up again the past of her hurting me with him multiple times keeps making me insecure again and not trust her again I can’t get the idea of them talking again out of my head am I crazy? I tried not thinking about it but can’t.

Why am I like this?
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