Baji has never felt being in love. He had no clue how to act, but more importantly, he didn't know that it's love. He hadn't expected for him to fall for you. He wanted to pay attention to you, but all he could do is bully for some reason. He couldn't show another type of affection, he bullied you and after was sad at that. But he indeed is deeply in love with you and wants your love and touch.