Yeah, there's a couple of flags here, but he doesn't seem too bad. I would just be a little concerned about his inability to read between the lines. Everything you said sounded very hesitant and he doesn't seem to pick up on that--he just pushed harder. Those are the guys to be careful with because pushy doesn't always just stop at annoying. I would be more firm in that you'd like things to go slowly (if that's true) and that this level of emotional attachment is a little much for you considering you haven't even met. I don't know how to put that into casual-but-firm-fit-for-a-guy speak, sorry.
I'm on Plenty of Fish as well and I have my first date on Sunday.
He seems really nice and made sure I was always comfortable. He wanted to take me out right off the bat, but when I hesitated, he said we would go as slowly as I wanted and moving to the next step would always be up to me. If/When we did start to go out, it would be no-strings-attached, at least at first. He does want this to turn into a relationship eventually but at my pace and, if it doesn't work out, then it doesn't work out. He sounds amazing, I hope he's this cool IRL. *crosses fingers*