My friend's boyfriend is back to drinking because of me, what to do now?

Prior to them (both 18) dating, him (let's call him David) used to hit on me many times, admitted to always having a crush on me, loving me. We used to hang out sometimes but I just didn't feel the same towards him and told him no, that I didn't want to be his girlfriend. I was into an older guy, a professor.

Fast-forward to nearly 3 weeks ago:

I (18 F) got dumped in my relationship (turns out he returned to his first love and I was just a rebound) and stupidly went to David's house, bringing drinks and a few pills. He was already recovering at a rehab center and I kept insisting him to drink and gave him a pill. I was dancing around the room and saying gibberish. He tried to tell many times ''But what about Lucie, your friend, we're not dating, we can't do this to her'' and my replied was somewhere like ''Oh Lucie, yeah, ok (laughing)'' and wasn't making sense by then.

I still remembered clearly that we had full clothes and kissed but fell asleep and nothing went further. I still wronged my Lucie and now because of this event, he loves me all all again (while I don't love him; I was just depressed at that moment) and is back to drinking. Meanwhile my friend Lucie is wondering what happened to her relationship, why is he cold, distant and back to drinking, back to being an alcoholic again.

So what can I do to make this right again? I have no intention of ever being with him. It was bad choices I've made when I got dumped. I overreacted and did stupid things.

My friend's boyfriend is back to drinking because of me, what to do now?
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