breaking up with my boyfriend...

I’ve had a boyfriend for the past two (would have been three next month) years and over the course of the years we’ve gone through a lot. Lately he’s been doing drugs (coke, molly, smoking weed) but he was doing it behind my back. I don’t know how long he’s been doing it for but I feel so betrayed that he would go behind my back and then lie to me when I tried to confront him about it. In the past he’s had troubles with lying and going behind my back so that’s why I’m so upset, he was doing so good.