I assume there's extra dramatic circumstances, but.
You obviously don't summarily stop supporting somebody right after a confrontation like that, even if it went "well"...? Like, it would be a great time to ask, "Do you think you want to go it alone now?", but...
Well, whatever, obviously it's drama time.
EDIT: Ah, just nonsensical bait on the author's part, I'm relieved. (Maybe foreshadowing too? If not then that was still an odd deviation in tone on Yuuki's part.)