Alright. I doubt I am an ENTP but I have dated a lot of them. Where you messed up with this guy is that you brought the option of a relationship to him. Whether it was because you cared more, you flat out said it, that is exactly the feeling he got. The problem with this is that ETP types are kind of screwed (generalization) when it comes to knowing how they actually feel.
When they feel something for someone they go for it 100%. When the option becomes theirs prematurely (you care more) they tend to roller coaster with their feelings, never settling into one complete stance.
Sounds to me like this has already happened with your guy, and I am sorry to say that it wont stop until a resolution has been made. The shitty part is, that all the time it takes for them to actually make a resolution, there is so much negative emotion associated with the relationship, it is going to be that you part ways. Logically speaking, that is the only thing that makes sense.
My advice? Start building up some good girl friends to take you out when the shit finally hits the fan, and know that when it finally does, there are less complicated relationships, with people who know how to care for you, out there.