So what happened was Flowey which was a bad part left of chara (which was defeated and part of the community now) was separated from asreil now they are 2 beings Flowey still wanting to be bad but sans takes care of that when he's trying to be evil.
Asked by DrySteadFastDoge Flowey when you turned back when you were trying to be evil have you ever done anything to sans? And has sans ever done anything to you?
Flowey-.........uhm Chara-Flowey what did you do
Flowey-uhhhhhh........nothing happened all I can say is he's a jerk Sans-YOU WANNA HAVE A BAD TIME Flowey-MEEP HES A SEXY JERK Sans-thank you I will PUN you (get it like shun pun) Flowey-GRRRRRR COME AT ME Sans-fine then