Long Distance Relationship

[Gaijin]

Ok this is bugging me since december, and I just can't think of a way out!

Me and my gf are used to distance and are handling it pretty well for the last 18 months, as I'm switching between 2 locations it's not all the big time we're
away from each other.
Either I'm in Serbia chilling with her, or she visit me in Germany and we have fun.

Now here it is where the problem comes, shes got place on a University in US, and that's far away (far far away).
I never told her that that bugs me, well it doesn't really... I thought...
The biggest problem is that I'll not be able to sit in my car and just drive to her or vice versa.

My question is, how to handle that! We are not going to break up or something and we both trust each other about cheating and stuff.... so the distance is not a big problem.

It's my first time to have something like that and I just don't know what to do....
How do I get the green card, is it easy?
Is there a way to be able to fly to US any time, an upgraded green card or something, idk....

Money and time isn't a problem for me, and she can't leave the place for sometime now, it's up to me to visit her!

The point of the thread is, I need to be able to travle to US any time I want!