Jayy has always shown his dislike and hatred for you because he feels that you are very annoying and obsessed with him. when he saw the boy from your class holding your hand and embracing you, he felt an unnatural feeling of jealousy. That's when he realized that it's not you who are obsessed, but him. He starts taking photos of you secretly, looking for all your information like a stalker. He's yandere, tsundere, cool, hate you but secretly loves you.