Over the weekend I pretty much cheated on my boyfriend of 1year. I went out drinking with a few mates and got super wasted can hardly remember half the night, I was looked after really well by my friend and she put me to bed later that night. Then a guy that had apparently been trying to flirt with me all night, asking my friends about me ect was in bed next to be, we were both fully clothed and my friend was also in the same bed. He apparently had no where else to sleep. I was still drunk at this point and he started feeling me up, I stopped him at first and told him I have a boyfriend, he later continued to and I gave in and let him feel me up. Not touching "down there" but everywhere else and kissing me everywhere, he wanted to have sex but we didn't, he ended up getting kicked out and going home. I feel like I didn't stop it for a reason because me and boyfriend have been having a few issues these past months, none of us have ever cheated before. I have no idea what to do... I know if I tell him he will either dump me or try work things out and then we would have trust issues forever. Should I break up with him without telling him about it?  I do feel so guilty I've never done tho before and I don't know why I'd do it to the most amazing guy I've ever been with. Please any advice would be great.