What's the key not being clingy but still being attentive?

Ok I asked on here a few weeks ago about over staying my welcome at a friend's house... he said he had homework, handed me my stuff, and opened the door basically lol. After that I saw him once but I had to kick HIM out of the car cause I had to go somewhere, and I had to rush him on the phone cause I had to go. Next time I saw him he walked down two house lengths to hug me hi, and we hung out for like two hours. He invited me to have dinner at his house with him and after showed me a video of him flexing. He had to go to a convention and said he'd invite me but it was full, i told him I was gonna see a movie with my friend anyway, which I was. Anyway, I guess I've always heard that you shouldn't be too available and since I stayed too long before I'm watching myself. Do u think I stayed too long? I think it went great it was just so long I wonder if I should've left earlier.