TOH
The thought warmed his heart. 'When I first saw how she interacted with Terashima, when I first met Terashima. I already knew I lost.' That's why, he gradually distanced himself from her. Sumire must have understood something had changed between them, because when Terashima left for the US for the second time. She didn't move back in, and when Terashima came back. She moved out without a second thought. He knew the living arrangement was temporary, but, the way she left- Toh shakes his head. He needs to stop thinking about that.
'I need to stop thinking about it, because I know her feelings now. I know it must have hurt her just as much as it did me, probably even more.'
Why didn't he notice all the signs?