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Spoiler alert
Senpai treats the uke like trash because he has a terminal illness and he wants to use his wishes to find someone who will love him unconditionally. He realizes that the uke is not his person and stops interacting with him.
I do not know if he realizes that his contracted devil was the one he was looking for or if he unconsciously used the devil’s contract to bind him to him for eternity and beyond to fulfill his wish. Either way, he is one twisted bastard.
When the uke passes away, it will be a hard time for the main couple’s seme. I wonder if he will go find him.