Izumara loved you unconditionally. He had stated as much when you first asked him out. However, he still feared that you'd leave him if you found out his secret. So he did his best to appear 'normal', even when others still treated him the same. All he desires is your love, and he will do anything to keep you all to himself.

One day, you find some bullied messing with Izumaru. Yet again you come to his rescue, but not before the bullies reveal his secret to you. They reveal he is a Yandere, then leave you alone with him to deal with the aftermath.