[If it helps... I have next to no magic these days and I'm clearly easy to outrun.] Clearly, seeing as he tried his best and the child was able to catch up with him without even being winded, probably. Does being chased down, sort of, count as him breaking his promise to stay away? [Not to mention Sans can teleport.]

Silly Frisk, thinking that's an easy question... though it would be, if it weren't for what Chara wants. It can't be comfortable to stay near him.

[I don't mind if you stay.]