A year is quite a long time get to know someone but it can be a limited fragile relationship if you are not absolutely comfortable with each other and have still to appreciate each others foibles.
You both have to go out there and take the risk - do the very things you both want to do - get fully immersed in Uni life and then see where life takes you. If you don't you could end up feeling resentful that you have not enjoyed Uni life because you were 'tied' to an ethereal external distractor. It would be stupid to think otherwise that you wouldn't consider straying with other new friends along the way. The demands of Uni life just to get to know new friends are huge. That can put a lot of pressure on both of you, but ideally you both need that agreement to be free to explore life to the max? If you can still do that and at the end of 3 yrs, 4 yrs, 5 yrs still be devoted to each other then you may decide to be there for each other for life?
The opportunities to try new things are wonderful and you may find yourself experiencing resentment if you have already agreed to meet up and stick with your old relationship, particularly when the boat is calling for you to get on and sail away to other exciting adventures.
By mutual agreement there are so many ways to meet and catch up - planes, trains, car. Meet half way, swapping and sharing the travelling time. Phone, skype, etc You could agree to see each other face to face at weekends, or perhaps once a month (or more) You could share events with new circles of friends. If you work out some ground rules to stick to so neither partner feels threatened it could work. However the opportunities are there to stray with a whole new set of personalities and exciting faces. Maybe you might have to agree to be open if ever either one of you has met a new significant other and be honest enough to say so if this happens.
Have you met enough people to know your other is 'the one' and this is shared 100% - From a few comments here I feel that this might not be the case, and that the glue on your partner might be stronger than your own? You are young and inexperienced at life generally (because of your age)
Its tricky because so many established relationships cope - many happily married people have partners who work abroad, are in the Forces or who commute a huge distance to work Monday to Friday and return at the weekend. A resigned but comfortable love.
You can only try and see how it all works out, If it is meant to be ..... it may well be pure sweetheart bliss and you go on to live to a 100! Who can say and who knows. Or you can agree to try and see how it works in principle and separate when the 'significant other' finds a new road to Amarillo and then be pragmatic about the whole thing.
That's the thing - it really is only your choice