Can't Get Over Her, Even After She Started Seeing Another Man

My wife had decided to leave me because she had found out that my x girlfriend had been in contact with me for the thousandth time and I hid it from her because I knew she would blame me for her contacting myself.  I tried to explain that the conversation was just casual and over the phone and that I had no desire to reconcile our past relationship over my marriage.  Well to no avail, I found myself living with my brother shortly after.  Then not but a week or 2 later, I find out that she is seeing another man that frequents the pool hall she worked at.  I then start to suspect that she was only looking for a reason to throw me out to justify her seeing this guy.  It's been over 2 months and it still feels so fresh.  I have been seeking out ways to get past this (i.e. Church, Counseling, etc.) and I can't get her out of my mind.  She led me on for a while and then turned around and told me that she didn't want to work on anything with me.  I don't understand why she is so up and down with me, and it's driving me insane.  I've never hurt like this before, and I want a way to heal, but I can't find anything that's consistent.  I'm tired of losing sleep at night, feeling depressed, worrying about what I can't control anymore, being dishonored and cheated on, and being treated like this.  Can someone help me find closure so I can move on with my life and get over this catastrophe?