My advice: Sort out your drug problem. Then think about guys

Hm..

This is interesting. I would just try and ask him straight up!

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Yeah, this.

To be honest he could be interested, really interested but it bugs him that you're back on the drugs so he's pulling back on you. Men and women are very similar especially in the dating scene. Pretty much all the advice given to guys in PUA could be given to women. The only real difference is the social norm for men to approach women instead of women approaching men. Everything else, all the "games" and stuff, work on both men and women.

OP, sort your drug problem out. Try not to blame others(Not saying you are or anything) and address the issue. You genuinely would be surprised at how many guys are totally turned off by women who do drugs, even smoking a bit of weed every now and then. I'm just saying -- you've given us pretty much zero info on this guy and the "games" he's playing -- he could be really into you but doesn't want to fall for a chick that's going to take herself down and him by being a drug addict.

Also, it could simply be that you're just being extremely paranoid... You did say you're back on the drugs and one well documented side-effect of drug use is paranoia. Keep that in mind...

Clean yourself up, try quit the drugs and you'll have a more positive outlook on life and all things relating to it(Including this guy). You might even start to see this guy be more forward and less afraid to pursue something with you the more he realises you're trying to better yourself and turn away from drugs.

Keep in mind this post is given with pretty much zero information on him or you save for "I'm back on drugs." and "I know he's a pick up artist and I know PUA(Even though you clearly don't)."

Good luck and feel free to ask questions but try give a bit more detail in what it is that's going on with him and you. No one's going to know who you are or who he is.

One of the worst things you can do in relationships is guess how the other person is feeling/thinking. Ask him. Ask him if he's learning to be a PUA. If he is, it sounds like he's doing it wrong. Once you know, you can discuss how his behavior is making you feel.

To give an example of why you shouldn't guess another person's feelings, he might very well be thinking you like him more because of his actions.
Would be nice to know what drugs you're doing. It sounds like you might be a little bothered by the drugs you're doing though, so try to stop. This guy shouldn't have any effect on your drug use. If you're saying the way he treats you is part of why you went back on drugs then kick him out of your life. You deserve better.
If he's really undermining you and your confidence get rid of him. Or at least let him know what he's doing is wrong and pissing you off or hurting you. Again, even if he is trying PUA material on you it sounds like he's screwing it up somehow. A neg is NOT a flat out insult.

Please do your negga stylee wannabe pick up artist potential boyfriend a favor and show him your posts on this forum. It might save his life.