He cheated right next to me in my bed

I've been with my fiance for 2 years now and im extreemly in love with him but... he cheats! Well on July 3rd I had a big party at the house and a lot of people were drinkin so I had a few friends stay so they wouldnt drive. When we went to lay down I told him a friend of mine would be sleeping in our bed and he said ok. Well when we layed down he asked me to have sex with him but I said no thats rude and so I turned over to go to sleep, then all of a sudden I felt them movin around a lot and he was trying to mess around with my friend with me right there and he didnt no that I was still awae and to be sure I waited till I saw him for a fact and when he lifted the covers he was rubbin on her and she was trying to get him to stop but he wouldnt. So I stood up on the bed and punched him in the face and told him to pack his stuff and leave (he lives with me) but he couldnt cause my mom wouldnt give him back his keys cause he had been drinkin. That morning I woke him up to talk and he said it was cause he was drunk and he cried and said sorry and so I stayed with him but I feel funny with him still and im not sure if I should stay with him but then again I want to leave him but im scared to hurt myself even more...I mean this isnt his first time cheating but I cant seem to let him go... What can I do to get over him when I leave him? Also if I do stay what can I do to get him not to cheat?

Hunny, hunny, hunny, im not a professional but I've been hurt a lot to say what im going to say... When something like that happens in a relationship its sooo hard to say goodbye, but if you know he continues to cheat... Hes not going to be a great husband is he. I dont know the backround of your situation, but I do know that it says PAIN all over it. Its hard to hear people say'leave him, hes no good for you...' BLAH BLAH BLAH... But you have to be ready for it. You have to wake up and smell the roses on your own. But make sure that you think about yourself before you listen to his alegater tears. I wish you the best. Be strong girl!!!

once a cheater always a cheater you are soo nice on giving him another chance I mean you can do soo much butter you luv this guy but he dosent luv you cause if he did he wont treat you like a doormate witch he thinks you r he know he can full around with other girls and you will always be there I mean you are not just hurting urself you r hurting your friends I mean (if) they know they know that you need better and to them you r like a sister and they cant stand seeing you in tears just break up with them you can do soo much better luv ya

That is grosse and if your friend was trying to stop him than just imagine what else he could do when he is drunk???

oh-my-god-get-rid-of-him-no1-deserves-that-hes-only-gona-keep-hurtin-u-n-u-cant-trust-him-u-must-feel-so-insicure-hes-messed-up-n-not-ready-2-commit-hes-treatin-u-like-sh*t-
u-must-b-so-stressed-n-u-cant-watch-him-al-time-tink-what-else-he-could-of-dun-what-u-dont-no-about-or-could-do-cant-get-any-lower-dan-your-friend.-ull-get-ova-him-n-find-someone-who-treat-u-right-n-mak-u-hapy-hes-not-da-1-luv-saz

WOW why dont you read what you wrote and think about it for a lil while....

Parties frequently end up in similar situations, and I do not see any terrible in this story. For a young man it is very exciting to be in bed with two nice girls. You and your male friend could even give him a nice experience. The 'problem' is that he is not so prudish as you two girls were/are(?).