<human>: Can you succinctly summarize the text in 1-3 sentences?

I recently (a month ago) started dating this guy. I instantly really liked him, he was super chivalrous, great sex, yadda yadda. I knew he smoked a fair amount of weed and, although I do not smoke at all, I was trying to overcome that as a very minor issue. 

Things are going great until last night, when I go over to his place where all his close/best friends are hanging out. They're all smoking weed, which is fine with me. No one pressured me or anything, which was nice. 

Then...two of his friends go out for a while, and come back with cocaine and anti anxiety pills. They just start snorting up in the middle of my guy's kitchen. I maintained my cool at the party but when my guy drove me home, I started crying. 

He felt bad about the drugs freaking me out, but also defended his friends, saying that they're his buddies despite the cocaine/drugs, yadda yadda. He also claims that he doesn't do cocaine, although with his drug history (weed, shrooms) I'm not so sure. 

I want to be able to hang out with a boyfriend's friends and not feel uncomfortable / be around illegal substances. Reddit, is breaking up with someone because of their FRIENDS' drug activity a valid reason?
<bot>: New guy and his friends do tons of weed and his friends do occasional cocaine/pills. I'm not comfortable with that, but I like the guy otherwise. What do?