Trust issues

A

My husband had a fling with another girl when we first started dating 5 years ago, I found out 2 years ago 16 days before our wedding. I still have trust issues when he goes out that he’ll do it again, he gets mad and tells me that I cant judge him for what he did when we were 17/18 and we’re more “serious” now. I’m so torn. I whole heartedly believe he hasn’t done anything since, but that doubt is just always going to be in the back of my mind. And he just asks if I’m ever going to trust him again? That hasn’t he proven himself?

Anyone have any tips for I guess getting over it? Am I crazy to still be mad? I literally cause a fight everytime he goes out over it (which is like twice a year).