Relationship help??? Can this be the end?

So just last week my boyfriend started experimenting with marijuana & alcohol. The kid almost had alcohol poisoning & he was passing around a blunt & a bong with people I don't even know. Bottom line, he lied to me about what he was doing those nights but he fessed up as he was getting sober the night of the vodka. I told him to stay away from that group of friends he was doing these drugs with & he at first didn't listen to me & chose his friends over me, his girlfriend/ best friend. I know you may say friends don't force you to do anything, but these friends provide it for him because they have it in their house. It's hard not to when your friend asks you & now he probably likes the high feeling. I felt hurt so I returned everything he ever gave to me. I feel empty now & I'm not dating him until he proves to me he wants me back & he's not with those friends. I found it very hypacritical of him to tell me to quit hanging out with my druggy friends when I never did drugs, but he hangs out with his & hes done them. It's just so hard to leave him because he is my best friend & I lost my virginity to him. I just want everything to go back to normal. Do you think he's still hanging out with these friends even though he did call me back the same night I gave him back his stuff & told me he wouldn't anymore? I feel so depressed I'm about to need a sedation..