I was thinking the same thing. As usual the uke has fallen head over the hills for the seme way too fuckin' quickly
You have to understand they are fated (soon to be) lovers, so while he may not show his feelings yet, he unconsciously feels them and wouldn't want to see his boss everyday knowing he has someone else.
This is a reicarnation story after all. Their connection is there, as proven by their liking to that flower painting.
True lol sometimes I forget the type of stories I'm reading
I don't understand the logic of the uke for wanting to resign a much needed well paid job because the person he rejected might have moved on...