Anyways, just remember that when it comes to friends, quality is better than quantity...
As for making new friends at college, are there any activities or clubs that might interest you there? I looked at your college's website, and it looked to me like it didn't have much. But perhaps you can find something. If not, maybe you could consider transferring to a different college, one that would be more fun, yet has the program you're in. If you don't want to do that, perhaps you can ask the guys in the gym if they have any friends that you'd be interested in meeting. I can see how difficult this situation must be for you. If none of those ideas work out, you could always volunteer somewhere outside of the college and see what happens. If I think of anything more, I'll add.
All I can really do is give you advice. Maybe you should spend less time with the boyfriend, but enough that he wouldn't feel neglected. That or you and him should go out to the bars. There's almost always someone you're going to run into from class or just about anyone from highschool. That's usually how it goes.
From there? Well.. You'll figure it out.