I've known a man in one of my friend groups for a few months now and we've seen each other in person 4 times at this point (he is newer to the group).

Each time we see one another, I see what appear to be signs of interest (buying me things, remembering details about me, asking questions, excited when he learned we have similar music taste, approaching me and initiating conversation, initiating physical contact, teasing me in a wholesome way, compliments, eye contact, walking me to my car). I'm feeling a flirty vibe, but am not entirely sure if I'm reading the situation correctly.

What are some key differences between a man liking you as a friend vs something more?