about a month ago I broke up with my girlfriend I dated for 2 years.. About a month after the break up we started talking again trying to work things out.. But last night me , my sister, and her friend were drinking.. And my sister passed out.. Me and her friend were by ourselves drunk.. She was all over me trying to do stuff.. And the alcohol got the best of me.. Me kissed and did some other things.. Me and my ex were "talking" again and I feel really guilty about it.. I want to tell her but it will break her heart.. Since we weren't together should I feel guilty about it? I love my girlfriend and I never meant to hurt her.. What should I do?