Sleepover with the guy I'm attracted to?

So I'm 23 years old and I met this guy nearly 2 years ago and pretty much liked him straight away. He's sweet, he's funny and he gets me. And like during the past year or so I've been going through a rather rough period, as some former friends spread lies about me and lost me most of my friends. Fortunately this guy didn't buy into them lies and stuck by me and has helped me get over it. I lost a lot of self-confidence after it happened.

Anyway, this guy has a super close relationship with this girl, let call her Liz (and I'll call the guy Steve) to the point that everyone thinks they are together which has always made me extremely jealous and also I was feeling really depressed lately. Anyway, long story short I ended up telling Steve how I felt about him, the friendship felt kinda awkward with me keeping it to myself.

Anyway, he told me he isn't ready for a relationship at the minute but he considers me his closest friend (which has made me way less jealous of Liz) and that he does love me and perhaps in the future things can be more between us.

Anyway, we're still really good friends and he recently invited me to have a sleepover with him and Liz. Gonna drink booze, watch movies and I'm gonna bring my PS4.

Just worried that drinking and getting drunk around him might not be a good idea. To my understanding we'll be sharing a room together and like well he has already made is position clear on the dating front for the time being.

Should I perhaps hold off on...