Love my boyfriend but also want to be single?

I have never admitted it to myself but sometimes I feel like I would rather be single than dating my bf. We have been dating for almost 3 years and he is my best friend but sometimes I'm bored and we are going to break up before college (6 months from now) but idk sometimes I feel like it would be better to tell him this? I don't know how I can simultaneously be in love with him but also want to be with other people sometimes and explore things. He's my first serious bf and I'm 17. Please help idk what to do!