My boy does coke occasionally, should I leave him?

Hi,

My boyfriend does occasional coke, maybe one a month or one a couple months, it varies. Should I should leave? Our relationships are up and down, but we always work it out. He not a horrible guy, hard working and is always trying. I don't know if this "occasional" will later be a huge problem? He said he will stop or is trying to. I didn't ask him or force him (say he quit or try to), the only thing I asked of him was is honesty, he knows I'm not into drug or thrill about it but I'm not going to judge. My concern is this a horrible thing that will be really bad, Thoughts?
My boy does coke occasionally, should I leave him?
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