Does anyone remember this yaoi manga? The uke had long hair... and an actor in theater or something.. the seme was a director? Basically the uke gets jealous after seeing his lover with someone else, coddling one of the other actors, and at the same time another man comes and snoops in to take the uke away not knowing about the relationship. Uke and other guy (camera-director?) kiss, seme is outraged when he sees it and pulls him away. And convinces him that he has nothing to worry about, that he loves only the uke. They aren't the main couple either!

Is it the second couple in Koakuma no Sanctuary?

YESSSSSSSSSSSSSSSSSSSSSS!!! Thank you so much!