Welcome to the boards, hate that you are here though. Its not easy but lots of people are here to help you along the way!
I myself became the OW when my H left. His OW found out too. BUt I can say that relationship eventually ended, took a couple of years, but she never could trust him in the end. I doubt the OW in your case will ever be able to trust him.
Take care
Kissak
"What time I am afraid, I will trust in thee." Psalms 56:3 M-37 H-37 S-10, D-15 M- 1993 First bomb- 12/23/06 Came and went too MANY times! Gone again 10-25-10
