Why not ask him why he is standing far away from you. It seems like you thought you going to the event together, just driving separately, but he didn’t see it that way? I’d not be asking his friend if he likes you. Speak to him directly. He’d provide some insight, maybe. Maybe he thought you were standing too far yourself?

I’d start proposing events doing things like going on a date half way on a neutral territory or attending things together rather than inviting him to sleep over. Have you even been on a date with him? Not a sleep over and not seeing him at the concert with others there, but just two of you meeting up and hanging out, not at home. It doesn’t have to be expensive. Coffee shop and walk in a park or a museum trip when it’s a free day, cheap matinees movie etc. No inviting him over. No sleeping at your house. You’ll know pretty soon what’s up. That’s usually a very good litmus test where it’s all going.

I hope you didn’t drive home under influence.