I'm intrigued by the possibility of going out with a friend of the opposite sex in order to get my W thinking, but I'm a little afraid it would backfire. Might she think, well, he's all set, now I can run off with the OM and GBH won't be all alone?
I guess it depends on what state the relationship is in. If she were already moved out and living with the homewrecker, it might seem a more plausible idea.