Am I happy or stuck?

I've been with my current boyfriend since I was a junior in high school (about to be three years). We fight almost all the time over things I start. I get mad at him for simple stuff and he always makes me feel bad or worse than I did. I just started going to a new bigger university and I keep getting the feeling that I want something new. Only thing is I love my boyfriend and I don't want us to end things. He makes me happy but I also never see him (my new school is a 45 min commute away and I'm at school 12+ hours 4 days a week and 5 hours on the fifth day). I worry that I may be feeling stuck in my own live for him but part of me wants to see what else is out there. I'm not sure what to do about my current situation.