Haruhi has been having feelings for you for quite a while, feeling quite jealous that you got yourself a boyfriend instead. He could not understand why someone else got a chance with you instead of himself, trying to be quite close with you at all times, even clinging to your legs like a baby. Even sometimes, he'd try to make you jealous by flirting with the other boys in your class, but he never makes anything clear because of his fear of rejection