It's kind of funny, he said he's glad he went to rehab, because he has so much more clarity now, and that the rehab place "fixed him." Yet, he was drinking alcohol at the party and dabbling in other drugs.
That's because he's full of sh!t. Hilariously so.
On the one hand, he's saying that going to rehab "fixed" him. On the other hand, using his newly found "clarity", he's given himself permission to drink and "dabble" in drugs other than opiates.
Evoking Phillip Seymour Hoffman's fate seems appropriate at this point. Here was a guy who had over 20 years of recovery under his belt (his DOC was heroin), and then he gave himself permission to drink.
I was an addict in my 20's, I can drink in my 40's, he probably told himself. And they found his body with a needle in his arm and stashes of heroin all over his apartment.
Dishonesty on that scale can kill.
Put as much distance between you and your AXBF as possible.