It is possible, and I know people who are making it work, but let me warn you, it is really hard. I sounded exactly like you this time last year. I was convinced that if anyone could do it it was me and my boyf (we'd been together 3 years and were unbelievably close). It didn't work, though. I didn't run off and cheat on him, I just acquired a new world view and a need to be independent and just be 'me' for a bit. What you have now is great, so enjoy it, but you can't ever know how much uni will change you until you're there. I changed too much and didn't want to put the work in any more.
Plenty of people have made it work I'm sure - that's just my experience, and I wish you lots of luck.