boyfriend cheated.?

okay, me and my boyfriend have been dating for 2 years now. Saturday night we got into a little bit of an arguement & i left hi house & called my friend to come & get me. Later that night i went to a house party but thought about him the entire night. the next morning my boyfriend called and told me he got REALLY DRUNK (apparently the drunkiest he has ever gotten) and kissed another girl. i dont know if the girl meant anything to him or if he meant anything to girl because she gave got with two other guys later that night. In our relationship we dont cheat. i feel betrayed & i feel stupid for sitting around at a house party and crying while he is locking lips with another girl. It really hurts. What should i do? Is it worth breaking up with him about it? Do you think he has done it before? is it true that “once a cheater, always a cheater”?
someone help.

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