Low sex drive in partner

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My boyfriend seems to have an extremely low sex drive now suddenly after he is now sticking to quitting dipping (tabacco) and I was wondering if this is normal for males to go through bc right now I feel really down like he doesn't want me sexually bc we dont have sex and he makes me stop touching him. He doesn't really have interest in anything sexual with me and it's making my anxiety go all crazy like I want to cry. I don't need any comments about him cheating bc he's not and I know he isnt. He also has been drinking lately to help cope with the quitting of the dip. I haven't talked to him about how I feel bc it's hard for me to and I'm not sure how to bring it up like I'm supporting him in quitting but I miss our sexy time and feeling close to him. I'm also real hormonal so idk how to bring it up. Again he's not cheating. He just talked the other day about getting a dog together. We live together too. He works a lot and he has stress. I just want to know if that's normal with the quitting