Long distance relationships (LDR) can work, but there are some that don�t. It just depends on the people involved, and how much trust there is, and willingness to make things work. You have to accept that he will be meeting new people, and having lots of new experiences, it might also change him a bit but that is not to say your relationship could not sustain all these things. The hardest part will be that he will be doing all this whilst you are seemingly stuck in the �old life�.
If your relationship feels as strong as you say then why not give it some time, such as a semester or two, make some pact that you correspond (write letters, email, text etc) or talk on a regular basis and take time to meet up. Maybe take turns to visit each other, and make regular arrangements to meet somewhere in the middle. After this time you can see how you both feel about the LDR and whether your relationship still has some mileage. Remember you need a lot of trust, respect and love to make things work even if you are living out of each others pockets, so if the LDR doesn�t really work then chances are that the relationship may not have lasted anyway.
I am aware that the above may sound a bit harsh and foreboding, but as I said they can work and many do, but you need to be pragmatic about life also and lead your own whilst he is leading his.