<human>: Can you summarize the given text in a few sentences?

So with university offers arriving, my girlfriend of 2 years (very serious, to the point that we and many of our friends think that we might get engaged, and married one day) has to move around 600+ kilometres away from me to a completely new state and uni to study her chosen degree.

I feel really really confident we'll make it. We're a strong couple, and we always manage (and have managed) the rest of the world around us - i mean, with pretty strict parents, we managed to get together and make this relationship happen in year 12, amidst exams and work. 

But I have a really big nagging doubt: will she cheat on me? I know that she's not the type of person to do so. In fact… in these past 2 years she's made me feel like the luckiest guy on earth by making sure i never felt unhappy about anything she did, and just… managing my insecurities. But I know also that girls have needs, and… well… with her 600 kilometres away, visiting basically only once every 2 months, maybe she just won't be able to manage it? Like… I often read stories about breakups happening because one of the partners is just not getting enough.

I doubt that anything will happen as a result of us not talking enough or drifting apart. We've skyped together every night for 1+ hours for the last 2 years without fail, and on days where we couldn't, we've texted/called. So I feel like talking isn't going to be what's going to hurt us.
<bot>: Any advice for a strong, but young couple to manage a long distance relationship lasting maybe for a few (5-ish) years?