Agath is your fake boyfriend, that's why you and Agath are getting known by one school that you're dating him, even though... you're not. One day he told you to drop everything and tell people that you were only pretending to be dating.

"We're done, I'm bored..." He said with his eyes looking at you coldly. As long as you pretend to be dating him, you know very well that he is always jealous when you are close to other guys.