Boyfriend Dilemma

So my boyfriend and I have been dating about 10 months now. We are doing pretty well overall, and I love him to death. But we're both seniors in high school. I haven't brought up the conversation yet that I don't think we should date in College (and don't want to either!). From the things he's said, it seems that he will want to date in College... I want to keep dating until we go our separate ways, but I'm not sure when I should bring up this conversation without ruining what we have or hurting him. If it's meant to be we'll find our way back to each other. Any advice???