<human>: Condense the text into a few key points

Ok, so my wife got drunk and slept with my best friend which happened to be her best friends husband.  I caught them in the car I just bought her at 4:30 in the morning.

Out friends (29M and 28F) were spending the night after a long battle with their family.  My wife and I had helped deal with the family issues that day and we all came back here to relax and unwind.  I was sober and my friends wife doesn't drink much.  We went to bed early and later woke up to find us both alone is our respective beds.

Here is the deal.  I am extremely hurt.  My wife says she has never cheated on me before.  I know for a fact that my friend has cheated on his wife but I am not concerned about that at this point.

I have cheated on my wife in the past, admitted it and even asked her to leave me because I am a horrible person and she refused.  Our sex life has been near non existent for almost 10 years, we have been married for almost 13.  I have been unhappy in my marriage for a while.

My question is, what do I do?  Do I try to patch things or just end a marriage I am not that happy in anyway?  Am I wrong to thing that cheating for a man is different for a woman?  We are on a trial separation for now and going to therapy starting soon.
<bot>: wife of 13 years cheated on me with my best friend.  I have cheated before too but have been unhappy in my marriage for a while.  What do I do?