How can I get over my boyfriend who is in love with pot?

So just two days ago, my boyfriend and I, which weve been going out for 9 months, broke up. he started really getting obsessed with weed. he bought about 200$ worthof it.. I told him that its getting wayy too far and that he needs to make a decision between that and me. he said he wanted to finish the 2 ounces that he bought, then hed be done. I told him no, he needs to stop now. and he said he couldnt do that. so I told him to call me when hes himself again, and hes ready to realize whos really going to be there for him in life., but untill then ill leave him alone. I havent called him since two days.. and already it is so hard for me. im cutting myself over it. I mean, I used to cut myself a few years ago, and I quit last year, but all of a sudden I started because of him. I know its only been two days, but im starting to feel like he never really did love me or care for me. and that he couldnt care less that im not in his life anymore. I need advice on how to get over him..im begging you..and please be straight up with me about what you think..

sorry that its a bit long.