Okay, if your DH was cheating on you would you leave or throw him out? I think I would in different situations.
If the affair had been going on for a long period of time and to me it seemed there was more feelings there - he would get the boot.
If the affair was new and he told me it wouldn't not happen again I think I could forgive him - he would pay though.
I guess I could also forgive if he came to me and told me instead of finding out from someone else to.