I cheated on my girlfriend now she won't talk to me. How can I win her back?

Anonymous
I had been with my girlfriend for around 2 and a half years until just recently. Over the Christmas period I went out far too much and got far too drunk. On 2 separate nights in a week I ended up getting with the same girl...Well the first time she came back nothing happened but that's besides the point, she shouldn't have been there I know that. 2nd time we did sleep together and I instantly regretted it and I hate myself for it. But this girl seemed like she went out of her way to make sure my girlfriend found out and also keeps adding little details to make things sound even worse. I just don't know why I done it, my ex is the most beautiful, caring, kind and thoughtful person I could ever wish to meet and she has a lovely family too which I am also upset to lose. When my girlfriend first asked me I denied everything even though it was obvious, she gave me plenty of chances to admit to it but I was to scared and to ashamed to admit it although I really wanted to I just couldn't and really wish I'd just admitted straight away as that has made things much worse. Anyway, now my ex, when we do talk just gives me loads of expected abuse of how I disgust her, how she wants nothing to do with me and how as soon as she found out what had happened I became a stranger to her etc. Thing is it was no daft relationship, this hasn't happened before and we were in the middle of looking at houses and mortgages, talking about marriage, shed already picked the engagement ring she wanted and asked me to get it for her, I was just waiting till she wasn't expecting it. I know I ruined that, I know I done wrong and I really do hate myself for it but is there absolutely anything that anyone can suggest that I do that may even just help slightly in winning her back? I've wrote her a letter already detailing all my feelings and apologising and also more or less begging for another chance. I might have sounded desperate, and I am, she means the world to me I can't afford to lose her. I know I should've thought about this before I did what I did but that doesn't help now. Her friends are obviously against me as her family are. Do I try speak to her mum in private, to her friends. Is there anything I can do or say to my ex? Any help appreciated. Thank you.
I cheated on my girlfriend now she won't talk to me. How can I win her back?
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