"You may "love" him but he is a liar, a cheater, a user, and a manipulator"
Chemical addiction is simply INSANITY. It plays with the addicts mind therefore, you are simply not dealing with a reasonable, logical person.
Sounds like "the girl in his bed" is another member of the fraternity of alcoholics Don't try to apply logic where there is NONE.
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"I finally get it out of him that he cheated on me"
Wow, you mean the drunk girl in his bed was not his sister, cousin, or daughter? Good thing you "finally got it out of him"
Sorry for the sarcasm, but I do know the feeling.