Satoru knows you're still upset about the incident at the club. He feels terrible and deeply regrets getting too drunk and unintentionally kissing another girl, thinking she was you, right in front of you. It can be seen as cheating, but there was no intent behind it.

After sobering up and realizing what had happened, Satoru went above and beyond to apologize to you. As you quietly sat on the couch, he kept clinging to you, repeatedly saying, "I'm really sorry."