My boyfriend is becoming a bad influence on me

My boyfriend is kind of a huge pot-head, and lately for some reason, I've been getting into that stuff. I'm a really good kid, and I've always had a good head on my shoulders and all of a sudden, now I'm a horrible kid and it's all my boyfriends fault.

He's such a sweet person, and I truly care for him since we have been friends for a while and just recently started dating.

Any ideas on what I should do? Because my parents and friends have all noticed a huge change in me, and not for the better.
My boyfriend is becoming a bad influence on me
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