<human>: Give me the gist of the text in a nutshell

I've been retired from the military for a year and after I retired my wife confessed she cheated.

We were living together for a year before we got married and I got orders to Afghanistan. I was thinking she should live with her parents while I was gone but she asked if I could rent her a place so she could finish school.

I payed for the apartment and left her my car since it was newer and more dependable.

Long story short she drove MY car 9 hours away to sleep with her ex boyfriend (who was a married man) and told me she went to visit her parents.

I called her parents during the time she was suppose to be there and of course they had no clue of what I was talking about. She gave me a lame story of her whereabouts and I fell for it.

She also gave me chlamydia during the marriage but she claims she had it the entire time we've been together. That I can believe a little but I'm not sure of anything that comes out of her mouth now.

She claims it's the only time she has messed around on me and this happened back in 2003. Fast forward to 2016 and I'm ticked because that would have been a deal breaker all those years ago if I had known the truth.

We have a 2 year old with special needs which is the only reason I'm still around. I love my son but I don't feel the same about her.
We are in marriage counseling now and I'm trying to give it an honest effort but mentally my heart just isn't in it.
<bot>: Should I leave the past behind me and move forward which is what she really wants. Or cut my losses and just take care of my son.