When is he coming round?
I know you probably can't eat, but even if you can manage a chocolate bar or something, do that. And put some comforting drivel on the tv.
He will act in one of two ways: Either all charm and contrition, a little shy and really polite and reasonable, or, cold and insulting. The first is to get you to believe he has changed and to wonder if, after everything that has happened, you might have been wrong, he made a simply mistake etc etc. The second will be to get you to feel so angry / confused / low that you will do anything to make him be that kind person you once knew.
However he acts Marilyn it is an act. Remember everything you have learnt over the past 48 hrs about him. Remember that he has point blank lied: to you, a good mutual friend, probably From Russian With No Love After All and likely his mum. Remember he has exposed you to STDs without a thought for your health. Remember he called you 'barren', that you had let yourself go, implied you were boring and unintelligent. And remember he has wantonly, cruelly and repeatedly betrayed your trust.
I don't want to upset you, but please have all this in mind when he comes round.
At the same time, have in mind that over 1000 messages on here and dozens of people - that haven't even met you - think you are wonderful and are spending the entire day thinking of you and sending you their support.