Boyfriend issues..

So my boyfriend is from Poland and we met during school. We've been dating for like 2 and a half years. And he's about to graduate college this year so we've been in a distance relationship for most of our relationship and we see each other every 2 weeks. Since I came to college, I feel like I'm falling out of love with him. When we're together, everything is perfect but when we aren't I feel like I never want to talk to him and never want to come back home to see him. There's a lot of pressure to get married within the next year or else he'll have to go back to Poland but I just don't feel like I'm ready for that especially because of how I'm feeling now. After he graduates he's moving closer to my college and we'll see each other more often. But I don't know what the problem is and I don't know if I'm feeling this way just because we're in a distance relationship. I've also met other boys here and it's just really making me question my relationship with him. What should I do? We have no problems whatsoever.