Well, that little tryst with an ENFP was rather short-lived. We got along rather well and I admit, he was entertaining company for a while, but there was something rather inauthentic about him that eventually turned me off. It was like he was constantly putting on a "show." He didn't take anything that remotely looked like criticism very well (he was very sensitive about the prospect of being wrong about anything, even if it was presented in a joking manner), and if he wasn't the center of attention, he would do his best to shift the conversation that way... exactly like one of the posters here pointed out.
But what really put me off was how I felt like I was being used like some sort of trophy. Like he was affectionate when we were alone, but as soon as we ran into someone he or I knew, his body language turned downright possessive. Arms around my shoulders, waist, squishing me into him... inappropriate displays of affection like nuzzling my neck when someone was talking to us. It was really embarrassing for me to be treated like that and I'd push him off. He'd also laugh it off if I talked to him about it in private and usually steer the conversation to something more good natured.
At first, it was endearing it be surrounded by somebody who was so positive and funny and upbeat, but it eventually got tiresome seeing the motivations behind the behaviour and how dishonest and selfish it all came to appear. His motivations seemed to be to put himself in the best possible light and "win" which completely juxtaposed my more harmonious, "everyone play fair," sensibilities.
In the end, I think I'm going to keep him around as a friend that I can stand in low doses; I really don't see this going anywhere. (Interestingly enough, though, since I've distanced myself away from him, he calls all the freaking time ... ).