Truth be told she is the woman you married. You were sleeping with her when she had a boyfriend. Like a volcano she may have went dormant for years. But all that activity is still bubbling down below. I think your stbxw bought into the family thing for awhile but something is always missing. She had the affair and became addicted to the brain chemicals. Now she’s chasing the dragon. It’s going to take a really long time for to figure out these are fleeting feelings.
Truth be told if you would of divorced her after her A five years ago there is a good chance you would have at least had the opportunity to reconcile by now. My thoughts are too much damage has been done now and you could never go back.
She’s in a really bad place right now and likely will be for a really long time.