I had a similar dilemma when I was applying to uni, minus the boyfriend. I wanted to stay at home but I'd miss out on the "uni experience", would be the loner of the course and miss out on oh so much....My want to save money for travelling meant that I ended up not applying for halls, and was of course doomed to being a friendless course reject who didn't have any of the great experiences other people on my course had.... Or not.
Not staying in halls was the best decision I've ever made, I got the best of both worlds, having a great group of friends who I crashed with all the time at halls, and a home where I had my washing, cleaning, food etc done for me... I can honestlysay I had the best time, missed out on nothing and ended up without any of the debt my friends have, and I can now afford to spend this year travelling.
What you need to figure out is if you WANT to stay at halls....if you do, then go, your relationship sounds strong and will last through it... If you WANT to stay at home, but think you SHOULD go to halls to get the "uni experience" oR whatever, then stay at home, because in my experience, you wouldn't be missing out.