He wants to take revenge on his lover. So I don't think he has any need to be so loyal to his past lover. I mean I don't think he has any fond feelings for him anymore/ they end it in a bad note. Therefore, he has no reason to be loyal. He can have sex. It's not like he is cheating. And if you can remember it clearly, he said, in early chapters, that he has some "needs", so I am guessing him having sex with so many has to do something with his supernatural powers. And I respect your opinion, so don't take what I said in a bad way.
Yea!! But I think the lover he is trying to take revenge is the mc, or at least that’s what I saw some people discuss about, that’s why I didn’t want him to keep having intimate relationships with anyone now that the mc is here :( but to be honest I’m not about that anymore, as you said he’s single and was hurt so I can’t blame him for having sex with other people

i'm not slut shaming the seme because he can do whatever he wants but why keep having sex with other people when ur in love w someone else or when u already found him? i'm just trying to understand because i never had sex before and never felt interested in that even if i love reading smut and stuff like that but would really love to know what goes inside his mind (also hate the fact that he did all that with the uke inside his house maybe i just feel jealous lmao)