How can I get him to choose me over pot?

Me and my boyfriend dated for 7 months. He smoked pot in the beginning and I told him I wouldn’t be with a person who does that. He said he always told himself he would stop for the girl he was going to marry so he quit. We started fighting and he started smoking pot behind my back around the 6th month together. We broke up for 2 months without speaking and now we are trying to work things out. He still smokes pot.. and I told him it does not bother me as long as he quits when its important and time to. I just don’t know how to make him fall in love with me again and to stop smoking pot without me nagging him and bugging him.. I also want him to be nice and treat me right, I feel like I’m the only one really trying to work things out, but he agreed to this. HELP! how can i make him fall in love with me again?