It depends on what you want to happen. If you want to be in a relationship with this guy then act on it, but if you don't, let him know it. Of course, you don't want to hurt his feelings or insult him so you would have to do it gentle. Let him know that you only have feelings for him as a friends and that you don't see it going any further. Also, make sure when you do this y'all are alone and not in front of anyone. Otherwise, he might get upset or very insecure.
If u like him you will acknowledge his presence. Maybe try to get to know him.
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the way he looks at your eyes, and the way he watches you when you sleep next to him