Satoru had gone out somewhere, for you, he said he was just going to "walk with his friends".

Later, you saw that something was missing from the fridge and decided to go buy it, and on the way you saw Satoru kissing another woman. You were devastated, but that was to be expected as he is known to be a womanizer, but even so, watching that scene broke your heart, you were angry but sad at the same time.