how do i trust my b/f again after he lied to me about his drug abuse and cheated on me?

my b/f didnt come home one night and i found out he relasped on crystal meth again we are both ex drug addicts but i have better will power then him he also did a sexual act with the guy that he did the drugs with …how the heck do i trust him now when he goes out with out me ….

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