Boyfriends drug habit and I being unreasonable?

My boyfriend uses cocaine, I was aware of this when we first started dating although I was led to believe it was a casual thing which I know most guys his age do. I explained to him I don't mind him doing it just never to do it when we are out or it would be the end. The other day we were going for dinner and stopped for a drink beforehand and we saw some of his friends in there. Basically he went to the toilet and did a line. We weren't on a night out we were going out for dinner. I knew he had done it as I could see the powder around his nose he denied this for 24 hours then came clean. I was so angry I made him leave my house. He then went on a bender for 12 hours drink and cocaine. Should I leave him? I don't trust him at all any more
Boyfriends drug habit and I being unreasonable?
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