[This is not a very good move on Frisk's part. Mettaton begins to step closer, looming over Frisk imperiously. There's no pretense; he intends to threaten.]

You should say sorry for quite a few things.

Human...I do not know why it seems that our lives have reached a divergent point, but maybe I should explain my side of the story, as you seem to misunderstand. Maybe you are not lying, sweetheart, but neither am I.

[There's something cold in his next words, and his expression matches.]

Do you want to know why I am so weird?