You have been a stupid clueless idiot.
Bless your heart--you trusted her to act just like you would trust yourself. She hasn't, FOR A LONG TIME.
Your marriage has been on the rocks for a long while, and she has been the major player in that problem. You were just too stupid and trusting to see it.
Sorry for that, but it's the reality of it all. Now get a lawyer.
Be sure you kick your dog on the way out the door this morning.
Travis