WAW - I can only imagine how you must feel. I just worry that if you are truly hoping that things will work out in your M and if he says he is going to date then you go out and do the same out of spite that it will just continue to feed a bad situation. At this point you can't be sure what his true intentions are. I am sure he is hurt, confused, & angry. He may be thinking that is what he wants - but you don't actually know what he would do in that situation. I would suggest not to start dating out of spite, but to do it only when you are truly ready to let go of your M. If you do start to date, it just makes it easier for him to say "See, I knew she would...". Try and be the better person - at least for as long as you can while you are still trying to save the M. Just some thoughts...