People don't like to hear the truth or people like to tap dance around instead of saying flat out what it is they want. I know. Up until this weekend, I was one of these people. Now, People will hear me loud and clear about what I feel.
I agree you should come out straight with him because time is precious and if he doesn't like you then you can move on. The more you linger with him, the more you going to develop a deeper feeling for him. I had a guy friend did that to me, he would act like he likes me so much and I never ask him because I really thought he likes me too. Out of blue, he is talking to another girl and when I ask him what is our relationship and he would answer as friend.
Just come out and say it and mean it. If you need and want clarity about the situation, let that person know ASAP. Communication is priceless. never assume anything. Let that person know what their actions are saying to you and if that is the message they wanted to get to you then cool. But if they have no intentions of anything more going on between you two then shut it DOWN!