Duped by my wife

Well my wife went into the hospital just a little over a year ago for the first time with depression. She met this guy in the out patient treatment program, who she claimed were just friends. At first I was in a real tracker phase checking who she was calling and things like that. I had heard that people in recovery for things like this can form a relationship. Well she went back into the hospital about 5 months later. I finally reached out to this guy to let him know and became friends with him. He assured me there was nothing going on. Him and Talked from time to time and we even had him over for his birthday and Christmas. I was so fooled on a few occasion when he told my wife he didn't want to be friends I said please don't do that to her. Not knowing I probably said please screw my wife. So Monday my wife tries to take her life again because if the depression. She called me to tell me what she did only because she didn't like the way she felt from taking all her pills. So I call 911, they get to her and she is alive. While in the hospital the nurse asked her for illicit drug use which she replies she smoked weed on Thursday. I am like WTF and she smile an says to me I am not telling you. I question her about having sex with Rob and she says no. So I call her sponsor for AA and let her know what is going on. We talk about Rob and she says it is not right. So I agree and tell her I am going to tell Rob she is pregnant to see his response. So yesterday I talk to him and do it, well boy did I not like what I heard... He came clean and was like it was on 5 to 10 times. and I am like AWESTRUCK. So I finally talk to my wife and tell her I know and said it was about 40 or 50 times and she yes.... The only this that was consistent was it was over back in December. What do I do from here? We have two beautiful boys, I truly love her. And am pretty messed up right now.

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