Since he already knows that you have a crush on him, pay special attention to the signs he's giving off regarding how HE feels about YOU. This includes both his verbal and nonverbal behavior. Does he flirt with you?
If he is receptive, try to spend more time with him. (Someone who likes you back will FIND the time to hang out with you.) Lastly, check-in with him by asking him directly how he feels about your friendship, i.e., whether you’re clicking on a romantic or “just friends” basis. For example, it could go something like this: “So it's fair to say you're aware I have a crush on you, am I right?” (He responds affirmatively.) Then ask, “So what are YOUR feelings for ME?” Let his response influence your word choice in sharing the information about his impact on your life. I hope you have a love connection.