I think it was done mostly in Nanase’s POV, but we got glances into Leo’s POV and it’s just as painful, he just had to deal with his feelings differently because he had duties to an entire kingdom. Leo never moved on, he’s just living a lie and as he said every day the burden grows, and him going into bed with his wife while silently crying is proof. He was one straw from breaking and running away. I’m sure if Nanase took him away he wouldn’t fight it, but they both thought the world of each other and wanted the other to live the “best” life. More evident in the flashback to Leo remembering their promise, that if he ever push Nanase away and hide it with a smile, Nanase should know that it’s a lie and he wants to be with him forever. The fact that their past lives ended in tragedy and no promises of reincarnation but Leo’s soul practically chased after Nanase so they could meet again is proof that his love was in fact just as deep
Rairairaise