it could be. he's beginning to feel the effect of the spell, making him nervous because he has a crush on you. on the other hand, the spell could of backfired and he feels uneasy and afraid of you because you tried to control him through a spell. my opinion is to ask him out. either way make sure he doesn't find out you cast over him. when i was first studying i was told by a couple people certain love spells will backfire if the person finds out. so instead of loving you, he'll hate you.
love spells are complicated, and everyone has their own opinion on them. if you do start dating, don't cast anymore spells over him, and do your best to make him like you for you. love spells do ware off, especially the ones you cast over another, how long it takes is different, just be aware of that.