How can I prove to my husband that I'm not cheating?

Blah31
Serious answers only. My husband thinks I'm cheating on him. About a year ago I found out he had tried to cheat on me (he was on dating sites and responding to personal ads on Craigslist looking for sex). He says he never went through with it and I try to take his word for it but I can't know for sure. Even though it's been a year, I still think about it daily and I am really insecure and paranoid about it. He thinks that because I'm so paranoid, it must mean I'M cheating on HIM. Which I completely understand him thinking that way, but it's not true at all. I'm only paranoid because I can't let the past go.. I've told him this and he doesn't believe me. I've told him he can look through my phone and my Facebook and whatever else he needs to look through and he refuses.. What else can I do?
How can I prove to my husband that I'm not cheating?
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