You finally meet him

It wasn't fair. Sans had finally saved you, did it the right way without breaking any moral code. And yet, it wasn't enough. So, he decided to play by the rules the world had given him.

This was his last chance. No more resets, no more redos or loading or saves. It was all up to him.

...what was so wrong with consuming a couple human souls to save you?

*it's hard to break someone...but it's damn near impossible to put them back together*