I think you should just start showing more interest in him, he'll get the hint. Say hello whenever you see him, ask how he is doing. A quick 'how is your day going?' can start a conversation pretty easy. If you see him on campus, ask where he's going and walk with him and chat. The more dialogue you have the more chance the two of you have to get to know each other. If you go out of your way to be friendly, you won't need to tell him that you like him, he'll get it.
He sounds polite, but even polite guys don't run back to catch a door for a girl unless they care what that girl thinks of them. (usually) So that's a good sign.

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