He was alone. Riku wasn't his Mom, wasn't his Dad, wasn't his family. He was just his boyfriend. On top of that, wasn't he the reason Sora had been talking to his parents less? Sora had been a bad son, hadn't he? His parents...
Sora turned back around. If Riku refused to go away, Sora would just ignore him. If he couldn't see him, he wasn't there.
He didn't feel like there was anything in his heart anymore. Just...sadness.