What would you do in this situation (messy breakup please help)?

[Sappho]

I was with my boyfriend for a good few months and it was the best thing that had ever happened to me, we were so good for each other and I've never felt the same for anyone, last weekend I drunk far too much and got myself in a state that I can't remember where and what I done, I left a party myself in the night and he was bombarded with calls asking if I was with him. I got home home safely but with NO recollection of the night, I felt terrible for putting him through that but if that wasn't enough I was told that the same night a guy had taken advantage of me and tried to kiss me, his friend pulled him off though reminding him I was in a state and had a boyfriend. Obviously, this got out and people had told him I had "cheated", but I genuinely had no memory of this happening and would never do this to him as I love him more than anything. I explained what had happened in person but he had nothing to say and later that day ended the relationship, he has not spoken to me since and ignored the masses of texts/facebook messages I've sent him. I can't accept the fact that it really is over between us, what do I do? and how do I get him to speak to me..

If that's not bad enough I sent him this:
"This is the hardest thing I've ever had to do but this is the last thing I'm going to send you, if your sure this is what you want and this is the way its all going to end then I wont text you, mail you and I'll just leave you to get on with everything, I'm sorry it came to this over something so stupid, I've tried everything I can to fix it but I know its my fault and not enough, obviously I cant just turn my feelings off for you so it will take time but I'll know if you read this and leave it that everythings done, I'm so sorry"

... he didn't reply