non stop accusing of cheating...

Ok I know I'm going to sound like a bitch.. my husband is a great, loving man who is always there for me. Lately I've been so jealous of his friendship with a co-worker and have been accusing him non stop of cheating. He's trying really hard for me to just stop accusing him but I can't it all comes back to me being annoyed by his friendship with his coworker. They text everyday and I've snooped and it's mostly about work or soccer games. I know I sound crazy, shit I feel pshyco but idk what to do. How do I avoid conflict and keep bringing her up it's so hard. I'm not pregnant so it's not the hormones.