It's takin over my happiness

A year ago my husband was using my cousin to vent through texting. We were going through a hard time about to divorce. When we decided to get back together a week later I cracked his phone because "just venting" wasn't enough for me. I saw all those phone calls in the end it resulted where he started to flirt. You see he was about to end out marriage because he couldn't handle some STUPID rumors around town and when I saw these heart breaking text messages that lasted a week I left for thr night. I ended speaking to him later about it and forgave him. I know I have forgave him but it is soooo hard for me to move on when I keep dreaming over and over about this. They say when you're pregnant you have super vivid dreams and that's what's happening but this is a vivid nightmare. I have praid to GOD to help me let it go and forget and make strong but it isn't working. I try and talk to him about it but he gets mad I can't help it to still feel this way. I really want to talk a councilor or something it's really eating me alive. Any positive uplifting advice would be nice.

HELP!!!!