Which is why I don't think the guy you're describing is an ENFP- most ENFPs are kinda insecure (due to always seeing all possible outcomes) about how others will react to us and because of this second guessing we're usually quick enough to pick up on any little thing and turn it into "oh no, they don't like me". Even if that assumption is wrong. We're usually wrong in that direction. But we're rarely over estimate how much others like us.
I still think he's an ENFP. Just a dumb one/overconfident one.

Maybe he's just immature and hasn't developed the empathetic side of himself as well as he should. I'm telling you, he
for sure is ENFx. The P and J are harder to tell when you don't know someone that well, and he doesn't seem very much like the ENFJs I know (a lot more upfront about being fanciful, not as opinionated, not strong at Fe at all), so for that reason I don't think he's ENFJ.
I spent a little time with another ENFP friend of mine today and I noticed that he was very un-touchy, at least compared to the other guy. Even with his on-again/off-again love interest who was also there, he was very specific about keeping to his space. He did push/poke her once or twice when they were running around and being silly, but they were both doing it, and it was in a respectful and nice way, not in any way overbearing, and then he immediately went back to his space.
But I don't think either one of them share the insecurity you're talking about, especially the one that I'm closer to that I saw today (the non-stalkish one). Most of his emotional battles seem to be of a specifically Fi nature, where the doubts are coming from within the self, and while they may be set off initially by external stimuli such as people, they originate and fester within. I don't think it would be a huge deal for him if someone didn't like him, at least not in an Fe "I must be unlikeable because this person doesn't like me!" way, but in an Fi "What have I done wrong? I thought I was being nice!" way. He might be upset, but it wouldn't get at him for too, too long. Anyway, I don't think he's very insecure; at least, he comes off as confident and self-assured. He doesn't seem like the type who might be derailed by unkind words (like INFP me, though I've gotten better about it

), but someone who could brush it off and keep on going with a smile. But just like any other type, ENFPs are a varied group, and there are many different ways to express ENFP-ness, so I don't doubt the validity of anybody's type simply for that reason.
EDIT: For clarification, in the above paragraph I am referring to a good friend of mine who is an ENFP, not the person who is the subject of this thread who raped my bubble.