I know what the author meant to go for, but it just doesn't work.
Anyone else except the MC is a douchebag I wanna see get beaten to a pulp, but the author is trying to make the reader feel sympathy or like for all of them in their own way. Which doesn't work with this execution.
No feelings come across except for those of the MC, even if you're supposed to feel sympathy for the ex (which would ONLY have worked if his introduction was different...) it just won't arise even the slightest bit after how shitty he behaved. I'm not gonna like a character that was introduced like THAT, so there is really no need trying. It's more obnoxious than anything else and none of the things the author is trying later on make it work and magically let you forget how much of a shitbag he was when he met his supposed 'lover he so desperately searched for for ages'. Just quit it and let him be the antagonist along with his new bitch-boyfriend. That would have made this more enjoyable. As it is now: It's not.
The new love interest of the MC isn't any better either tbh since he could have gone with any reason except for "Ah well, I only pity-fucked you, so don't go catching any feelings, 'kay? :)". I DO get the apeal of an aloof seme that doesn't have any feelings for the uke yet, but goddamn is this intro for him trashy.
All in all, the MC should fuck off away from all these people, start anew somewhere else and get a regular, average and decent person to fall in love with. That, at least, would be better than wasting time with any of these shitheads tbh...
It's just not enjoyable to read, nor can I really say I have any interest in the story given how bad the logic and execution is.
Hard pass from me on this one.
Ways of Parting