He's madly in love. And, he did those bad things to Tsukasa's gf's so that no one can get close with him. He's a psycho ヽ(`Д´)ﾉ
he is (insanely) in love with him, but he is also intimately aware that he pretty much set the entire thing up. If not for him, Tsukasa would probably have kept dating his first girlfriend, or at least broken up under much more stable circumstances. He's also the reason why he can't stand Omegas, which set the stage for him to swoop in as something new and exciting. He's definitely trying to make this relationship last for as long as he can, although the reasons are not... good.
Thank you to both for your responses :)
(●'◡'●)ﾉ
But, I still hate that seme ヽ(`Д´)ﾉ
Hold up i am confused, what does Yoshiki mean when he says even if none of it is real? Does he actually love tsukasa or is he just trying to make him his pair so he can throw him away like his other pairs?