Unless you know without a hint of doubt that you are absolutely, deeply in love with this girl (and she with you), don't do it. Please spare yourself of the potential heartache.
You sound like a hopeless romantic, just like me many moons ago. Perhaps you won't understand what some of us are saying unless you experience this yourself. So it's a moot point in trying to persuade you otherwise. Sounds like you need to experience this first hand.
I'll share with you my personal experience. This happened approximately 2 years ago. I dated this girl for almost 5 years, so yeah all of college. We were very much in love. In fact, we even got engaged. I was getting ready to move once I graduated from college so I could be with her. Well, six months before that happened, we got into a fight one night and I later found out that she went out with some guy (her so called friend that she met at a wedding a 2 months prior).
Actually, they've known each other for the better part of a year. I know she loved me, but eventually the distance and loneliness got to her. That's not to say what she did was right, but in a way, I do understand (she's still a bitch for what she did to me).
In the end, I was the one who lost. Hell, I even turned down an internship with Intel for that woman. You have to decide what you are willing to give up. If you are willing to give up everything (like I did), but things don't work out, just remember that you made a choice and it is one you have to live with.
Good luck, man.