Cheating...to stay or leave?

I found out 2 hours ago that my boyfriend of almost 2 years has cheated on me tonight. I haven't spoken to my boyfriend in over 24 hours. He was supposed to come home after work tonight but he didn't. He didn't text or contact me and its 5 AM and he still isn't home. I've heard from people that he got really wasted and slept with another girl. We share everything in our relationship, we were planning to move in together soon and he had bought an engagement ring. We were both so against cheating...he's been cheated on before. We had a strong foundation of trust and could get through anything. We were supposed to be together forever...Without him, I don't think I have a reason to live. I know that I'd be stupid to take him back. I wouldn't be able to look at him the same...I wouldn't be able to forgive him or even touch him anymore. Our relationship has been tainted. My self-esteem has reached an all-time low...and it's already bad (I have an eating disorder). I don't think I'd be able to go on without him...in all honesty, I would probably result in suicide. On the other hand, I don't think I could stay with him. I want everyone's input on this...I need some serious advice.