There's this boy at school who always messes/flirts with me. He always randomly grabs my hand or hugs me and holds me there while not saying anything or letting me go, even if I try to get away or ask him to let me go. He then carries on like nothing happened and does not seem to pay any attention to me afterword. I don't understand at all. I also have no interest in him; he's just not someone I can take seriously. I've already told him to please stop. What can I do?