Idk what to do (rant)

I'm in a serious relationship right now. He makes me so happy. He's been my best friend for a long time too. My mom knew about this and was ok with it, but still skeptical because she's religious and my SO isnt.

Last night she found out that I've been smoking weed with him, and now she says that I'm a drug addict that'll do anything to please him. She wants me to stay away from him while I "gain back control". But I'm an adult and at the end of the day, I was never pressured into doing it. He offered it to me to try once and I said no, and he respected that and never asked me again. I made the decision myself months later to try it.

I'm not sure where I stand with religion now, but with my mom having been a serious Christian for so long, she told me that he doesn't really love me because if he did, he wouldn't of let me try smoking. That I'm too young (21) and naive to know what true love is. And that really hurts. I know exactly how I feel about him.

I'm willing to quit smoking to give my mom peace of mind, but I'm not just gonna drop him.

Just last week she was talking to me about him possibly being her future son in law, and now he's this terrible person. Idk where to go from here.