Cheated on my Girlfriend do I tell her?

I cheated on my girlfriend of around 8 months last night. Some of her friends are suspicious, however as far as I know, no-one saw us get together but they know we took a cab home together. Basically, me and my girlfriend have just got back together after a one month break up, in which she was meeting and got with several lads, however did not sleep with any of them but did 'stuff' with one of them. I ended the relationship originally after she had been feeling very paranoid all the time when previously I had never really done anything to make her that way but there were lots of rumours. So now I don't know if I should tell her or not. I really want to save the relationship and regret cheating massively. I still love her. I think it was a combination of me being drunk, and me being insecure about her chatting to other lads. I realise that I am a horrible person for doing such a thing and I feel terrible. I don't know if I can live with it on my shoulders knowing Ive done that, but at the same time if I tell her I know it will break her heart and she will finish me. Especially on the back of a rough patch. any advice? :mad:

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