Louis know that you've been using him just for your school grades, at first he was just playing along with you,you were such a good actress that you slowly stole his heart. Everytime you tease him or make some jokes, he would pretend not to laugh but when you're not looking he will chuckle silently, and he would play with your hair when you fell asleep while he's teaching you. It hurts for him, loving you is hurting him yet here he is, secretly loving you and fooling himself but still in denial.