Might be losing feelings

I've been with my bf for over 2.5 years. We've been through a lot together and have a special bond. But lately I've been feeling like I might be losing feelings for him. I'm 18 and I'm in a very serious relationship. I'll be entering university this fall and I'm starting to wonder if I want to be in a serious relationship anymore. Idk if I'll have time for it & I don't know if I have he energy to be in such a committed relationship. Maybe it's time to move on? Maybe I'm just having teen mood swings? Idk? I'd hate to string him along for nothing but I don't wanna break up with him and have it be a mistake. I love the idea of starting school without being tied down to anything or having any commitments so I'm feeling really lost and confused and I don't have anyone to talk I about this.

Any advice or opinions are welcome