Sometimes if someone is hell bent on making you choose weed or them, depending on the importance of a person to you, can help with the decision. I know personally some people who smoke weed and still continue their days just as well and sometimes better than every one around them. Weed isn't really a bad thing. It relieves stress and can cause temporary happiness. Some people aren't worth cutting your own happiness to make them happy. Some people need an outlet. As long as you aren't over spending money you don't have on weed or doing it too much around her, maybe she will loosen up. Maybe she is just really "anti-weed" and if that's the case, if you quit, would there be a chance that she will find something else to change about you? Sometimes smoking weed can become a life style. It can take control of you or you can be in full control. Either way it's your choice. If she doesn't respect that, than maybe she isn't for you. No one should have to stop any form of happiness unless it's truly a danger to themselves. If it is a danger, seek out help in the form you see it. I'm speaking only from personal experience. I made the mistake of making an ex stop smoking. I ended up changing him completely, and it was horrible. He became angry, someone I couldn't even recognize. I not only changed that about him but I ended up changing everything about him. Sometimes stopping someone from their "outlet" can have serious repercussions. If it was your mother or sister asking you to stop, than that's another story. But she is your girlfriend, another fish in the sea. Just don't let it take over your life if you are addicted.