This is very simple: he already asked if you were interested in him, and you refused him. So you can't expect any further initiative from him.

This leaves you with no other choice but to take the initiative yourself. So continue doing the hand holding stuff, and ask him to go with you for this homecoming dance.

Continue to make sure you have activities together alone with each other, and become more intimate. When you feel confortable, and preferably in not too long (next time you go out for instance, or the following one), say something like you enjoy his company, and so forth: push your relationship into increasing levels of intimacy, tell him that you enjoy spending time with him, and that you want more of it. For the finishing touch, kiss his lips when you tell your goodbyes. Next time you can ask whether he would be interested in going out with you, and your roles should become more balanced.