after hundreds of genocides, you chose to do a true reset, which angered flowey. But you didn't want to kill anymore, you hated the thought.

You wandered through the ruins, and after you spared toriel, she gave you a hug. You thought you might've cried.

You left the ruins and went towards the same bridge where you would first meet-

"Human... Do you not know how to greet a new pal? Turn around and shake my hand."