Fr??? He's a main character IN a ridiculous drama, we are OUTSIDE watching everything. People usually say the third party sees more than those involved.
Besides, he did grew poor and orphaned, he doesn't necessarily grew up like some independent badass, he is insecure and lived years with a manipulator smoocher. Going from that in one leap to a rich boyfriend? Real drama does exist with this wealth gap couples irl, his worries aren't unfounded, the author decided to go with this kind of route over just becoming confident on his bf's background.
Ik it's frustrating but the title says ALL about what the author will make the characters go through lol
Considering how long they were together it's very easy for his ex to manipulate him and people with issues like piljoo are very easy to be manipulated imagine how worse it could be for someone he had loved in multiple ways and for years so tbh I get people being mad but poor piljoo as well it is probably a lot on him