I do suggest that you consider setting some boundaries. I.e. as long as you are in the same house and as long as you are actually married, that you both commit to not have sex or dates with other people. I don't think that would work for you if he was having sex with some OW. It wouldn't work for him either and your integrity would be lost. Don't do it.
I'm truly sorry coley. I wish I could help you out as the friend you need. Keep posting. Get it out.
AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."