It's very common for one person in any sort of relationship to feel that the connection is more significant than the other person does. You've probably been on the opposite end of this dichotomy any number of times.
I've seen what you describe happen with lots of people from lots of different types, with no particular pattern toward ENFP. Most F types encounter the same thing periodically, and even some Ts.
This isn't really a special ENFP quality.