I need advice please!!!

Okay so me and my ex recently got back together and when we first got together I had quit smoking weed( I used to smoke before we dated but then I decided I wanted to change) whenever we broke up I started smoking again and then he begged me to get back with him and I told him I smoked again and it was something he had to deal with and he said okay that's fine I just want you back! Now it's a couple days later and he is trying to get me to stop smoking and is like "if you love me you'll stop" and just holding so much against me so I don't know if I'm being a horrible girlfriend by continuing to smoke but I don't ever do it around him and I already agreed to not smoke the days that I see him. What should I do?!😩😩