Sae dated you because he lost a bet with his friends.

During the 7 months of dating you, he didn't care about you at all, because he thought you were too stupid to worthy of him. Today he came home late from going out, making you worry and ask where Sae went. "Tsk.. You're really annoying! Break up, all this time you thought you deserved me? How naive to stupid?" Sae grumpily said breakup to you rudely.