Wow some of these posts read like they are straight out of a 1950's time warp. In the history of all time women have been following men around while they pursue all of their life dreams. When a woman gets an amazing opportunity to attend an Ivy all of a sudden she's lame because she doesn't "put the relationship first?" This is an out-dated double standard.
But back to OP's actual problem. Why not ask her if you can keep doing long-distance? If it's meant to be you'll make the distance work. This will give you both time to really examine where you see things going professionally and personally.
Wait you can't be serious? Those two situation aren't comparable.. women in the 1950s (whether you'd like to admit it or not) had a specific role that was much different than a man back then, and much different than a man now...
I really don't understand, it'd be awfully "romantic" for him to follow her around and put her priorities in front of his, so when she loses interest and is completely turned off by the fact that he isn't doing his own thing, he can think of how this "1950's time warp" idealogy of every other person on this forum , is perhaps rational? And before you say it, it may end up in a happy ending, you never know... but take it from a guy who's been there, and done that, and has also witnessed a few close friends mindlessly do the same thing, it ain't all butterflies and rainbows and the stats surely aren't in your favor, especially considering the way she's treating this entire situation. I could sit here and argue that OP has a lot more options than a woman in the 1950s following her man and his dreams, but I'm not here to argue, I took the time to write this out because I'd rather OP be a happier version of himself in the long-run.
Regardless of whether you see it this way or not, I've dated plenty of women and I know the majority of them would be completely turned off by the idea of some dude trailing them while they did their thing and he just didn't do his. It's a lot more attractive to move on while doing your own thing and then meeting up four years down the line when you guys are both mature, working adults who could balance a relationship (if life heads in that direction); however, to say that everyone's opinion here is too old-school is dangerous and I don't know OP, but I'm a nice enough person to want everyone to be happy, even if I don't know them and OP to be honest, it ain't worth it man, take it from someone whos been there and done that, if you'd like to shoot me a PM and talk let me know man, but most of the people in this thread telling you to move on and do your own thing are logical and only want you to do what's best for yourself (heck we're all here to become healthcare professions so our hearts should be alright!).
And take this from a guy that appreciates women so much and having a significant other that you can count on, and a buddy nonetheless, is one of the greatest experiences I've experienced and those memories hold a dear place in my heart, but just try to look at this from an outsider's perspective man, I know when I was in a similar situation, I couldn't see clearly and I'm sure as heck glad I didn't take the 1950's time-warp advice. And for reals man, if you guys are meant to be, just as everyone has said, it'll work out down the line. I know a beautiful couple in their mid 30's who took time off to pursue their PhDs and do their own thing, and they ended up finding each other again 5 years later, they have a beautiful son who's a year and a half old and hey... they both got their doctorates and are living the life with their family! Sometimes life is worth waiting for man, but find your life first, figure you out, and realize who YOU want to become... that's just my two cents man, I hope things work out for you in all regards man, goodluck!
edit: Also for the person above saying this forum doesn't have relationship professionals, I do agree, but I think one of the biggest tools for this sort of thing is life-experience and constant trial and error. Anecdotal evidence is only so powerful, but man someone gave me this advice before and I'm sure glad I listened to them!