Boyfriend did drugs and he promised he wouldn’t?

My boyfriend a couple months ago did cocaine (he’s an alcoholic and used to do drugs all the time). After I said I’d leave him he cried and said he would never do it again. A mutual friend told me he just did it last week, but that he felt really bad. He’s lied about other things too.
I shouldn’t look back or feel bad right? I should break up right? He won’t change. He didn’t do it for 6 months but could have lied.

Boyfriend did drugs and he promised he wouldn’t?
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