Had a major backslide.

W was there she was soooo cold and distant.
Then OM walks in and I go to excuse myself my gut was in a knot.
I could not stay there...
I ask her that she could find a ride home im sure
She says what do you mean (vicious by now)
Me- I know about your affair with OM
She asks me to leave (denial and hatred)
Denies everything we are just friends blah blah
I walk out
yet she comes home @ 10:00pm a first
boy did I screw up\


How could I have handled this differently?
Is there any hope now ....?