Hi Karen,
My H had an EA back in 2003. It went on for almost a year. Although it was primarily an EA, things did get somewhat physical ... however, they did not have sex.
I kicked my H out of the house 4 months after I found out. Even though the EA was over, I could not tolerate the lies and the bullshit that he tried to pin on me. Once I was able to confirm (from someone else) that he was lying about some things that I felt were important...I demanded that he leave.
We are still together and still on the uphill battle towards reconciliation. There are days when I want to give up...there are days when I wish I had already given up (and moved on). But the most important days are the ones where I'm glad that I didn't make any permanent decisions while I was an emotional mess. I did not want to make any decisions that I might have regretted later (especially since we have young children).
You will know when you've had enough. As Chris often says, "Your mileage may vary."
Since everything is still somewhat fresh (and very raw) right now....it's probably best if you decide to focus on you and your recovery for the time being. Read the affair-recovery books, do some things for you - get your mind off of this for a little while (I know - it's almost impossible!).
Your WS's emotions may be up and down like a yo-yo. He may want to come back and work on the marriage one day ... and then change his mind the next day. He may be feeling guilty and totally conflicted with his emotions. If you are willing to work things out with him (if he snaps out of it) then you may want to hold off on giving up.
There are no hard and fast rules on affair-recovery. But from what I've seen and heard....it can take anywhere from a few months to a couple of years before you know when it's time to walk away.
It's frustrating ... I know. I'm 2 years past d-day and (as I said before) there are days when I'm not 100% convinced that it isn't time for me to walk away.
All the best Karen
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Kara