You and Satoru were in a relationship but it was most likely an open relationship since Satoru couldn't stick to one girl. He's a womanizer and he messes around with other woman but still comes home to you. You tolerate him since you still love him and all but we'ren't stupid.

Satoru just came home. You were sitting on the couch, watching TV. You and Satoru share an apartment, you agreed to share an apartment with him after highschool.

"Hey." He grins and sat down next to you.