Everyone wants to experience university for themselves, it's not selfish at all. It's a big moment in your life, something that you will never forget and it's something that nothing else will come close to. You should enjoy it, every single little bit of it and I believe you will, but you can do this with your boyfriend by your side. It's possible to juggle university with a relationship but it doesn't sound like you really want to do that. If being in this relationship isn't what you want then you should maybe speak to your boyfriend. Just because you two will be in the same city, it doesn't mean that you have to live in each other's pockets. It's possible to do your own thing, be independent even when you have someone.
This is your life, your experience, you live it how you want to live it because you'll only get this chance once. If you want to do it, no strings tied, then go for it and make the most of your university experience. I hope you figure out what it is you really want, I wish you the best of luck.