Friend needs help with relationship prob.
OK here's the deal,
My guy friend just called me to ask me for help, but Im not sure what I should say (I told him id call him back later). He had an "affair" with this girl and they went ALL THE WAY. Also she found out that he had a girlfriend (who has NO IDEA what's been going on) and says that she doesn't care. He has no idea what to do. Should he keep it quiet? Tell his girlfriend? End it with his "mistress" or still do it? Act like it never happened? Or what? I don't want to be a bad friend and tell him the wrong answer.
Thanks for any and all advice.