How to move on after cheating?

My boyfriend gave me his passcode and while he was sleeping I went through his phone. I found out he cheated on me 3 months into our relationship. We have been together 2 years now. I can’t look at him the same. He says he didn’t cheat because they didn’t do anything other than meet for dinner and talk. How do I move on like I didn’t know this and make us go back to normal? Am I overreacting for taking my promise ring off?
How to move on after cheating?
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