Lets see, I would say give up on your current relationship. Obviously you have no sexual interest in her and have pretty much just gotten to be really close friends. There is no point staying in a relationship just because you feel "obligated" to the other person. And if you really have to come on here asking if you should leave your current for a new crush, than unfortunately you should be moving on. The new one may not be the right person, she may just be the "excuse" you need to get out of this relationship. You are still young.

I'm curious, if you don't stay in relationships because you feel "obligated", why the heck would you ever stay in a relationship? Just bail whenever things get a little rough.

Also, I'm pretty sure that asking us whether he should leave ISN'T a sign that he should leave - it's a sign of other things that need to be worked on.

I'm not saying that you should stay in a failed relationship. What I am saying is that it sounds like your leaving for the wrong reasons (another person). Not to mention the fact that if you leave your current GF, and hook up with this other girl really soon, there's probably going to be hurt feelings.