Hi Lolobug
I cant offer much in the way of advice on the cheating husband
but I can tell you what has helped me to deal with obsessive
thinking, those thoughts that are destructive to our own serenity.
I take small steps, a few moments at a time, I pray to my HP and I let go of them, I may have to do this many times as the thoughts
begin to be intrusive once again.
Letting go and letting God has helped me so much with resentment issues or the panicky times that I didnt think my daughter would live to see another day.
Eventualy the thoughts flee because we give them no room to
invade !
I wish you well
Hugs
liddy