Why do i do this when drunk please help?

i such an awful person hen i drunk i have a boyfriend that i love to but of 8 years, but when i really really drunk i flirt with other men and always get turned dwn thank god .i even pee the bed i ust cant control my self in any way ive tryed drinking less but when i drink its always at partys and you dont realize how much you drink i hate my self for this i love my family and dont want to break it down but if i carry on like this i wil, im bi polar type 1 could this have something to do with it ?