if OM hadn't left my wife, she wouldn't be reconciling with me
That's a very understandable thought, BC. But you're looking at it the wrong way.
Instead, say, "I was fortunate that my wife came back to me, even though I didn't do things right and only because OM dumped her. Now I'm going to really work on my marriage, including AFFAIR-PROOFING my marriage, so that God forbid if this ever happens again, I will be better equipped to deal with it."
That being said, you are, nevertheless, in a precarious place, as she may be just one "OH, I'M SO SORRY BABY!!!" OM phone call away from leaving you.
Use your time wisely, and please keep some sort of intel channel open in order to protect yourself, brother.
