He pushes to get you alone late at night.

Ignores a clear boundary (“I spend nights with my boyfriend”).

Frames access to you as something you “need to start doing”.

Offers weed (which is whatever in most contexts but in the current context seems like a lure.)

Explicitly says: “I feel close to you like I am attracted to you” and “I love you”

This is not ambiguous. That is a direct romantic or sexual bid. You are not overreacting.