I found out my wife cheated on me two years ago what do I do?

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My wife says anything that I wouldn't do in front of her is cheating. Same goes for doing things I know she wouldn't like with another female. I was going through old pictures on her Instagram for an anniversary video when I came across posts where she is talking to multiple people. Telling one to text her and another to skype her. This was long before I had Instagram so I never saw them until now. She started talking to these people during a break up where she left me completely alone for the holidays stringing me along while she was out doing her own thing. We worked through it even after that. Yes I know I sound like an idiot. I happen to be a very forgiving person and believe in second chances. We've now been married for 8 months and have a child. Since being married I did speak to an ex. I care about people even if we didn't work out. She said it was cheating even if it wasn't sexual or physical. So I discontinued the friendship and to her I've tainted our marriage because I knew she did not want me talking to my ex no matter how innocent it is. Point taken and respected. So now that I found this and it wasn't an innocent friendship but sexual with these people I don't know what to do. She says it was when we weren't together even though the posts are clearly when we were together and they have the dates. She's just denying it all even though there's clear proof and it was sexual and maybe not physical.