Have you ever been probed by an ENFP, in person? They can ask some pretty damn personal stuff and can be very persistant about it. Frankly I found the experience to be highly annoying.
And what's wrong with INFPs? Do you believe that ENFPs are the one and sole type that you can have a healthy, growing relationship with? I'm curious now. Were you interested in the girl because of her personality or her personality type? If you only look for ENFPs you are cutting out the majority of the population who could have been perfect for you. You could have lost a chance of a lifetime just because they weren't an ENFP. You can't just categorise people into boxes.
I don't understand why you can't be friends with her even if she is not interested in a romantic relationship. If she is a worth while person then she is worth your time. What's in store for you? How about a new frienship, someone whom you can count on, a person to hang out with and have a good time with. That seems like a worthwhile investment.
You seem to have a bit of an obsession with ENFPs. I hope you realise that this can be unhealthy.
Advice from my ISTJ father: JUST RELAX. <--- That's all.
NO NO NO!!! Of course I'm not cutting out the rest of them. I just have a tendency to be strongly attracted to ENFP's. I can't explain it. And there is a very good possiblity that the girl I was chasing was an INFP as she didn't get out much. And yes, I believe you could have a healthy relationship with anyone so long as both people want it to work.
In this case, the ISTJ, I DO NOT want it to work. lol