Here's what you do: Talk to a teacher or with your parents about the situation. Be honest about how you feel (maybe don't speak too vulgar). Then, once you informed someone of how you feel, confront them. If they hide, find them. Sometimes, all you need is a conversation. Maybe they are using you and that could very well be that way. It could also be that they deleted by accident and blocked you because they thought you might get mad at them. Please do not forget the former, though.
