can u tell me what part he did best in their relationship?
The part he said 'i don't know what to do anymore' and his ex not denying it
no, the lack of respond doesnt mean that seonjae did his best. if he did, kanghee wouldve never felt insecure at the first place. it was also not mentioned by seonjae that he apologized to kanghee went he told him that he sees dongha's eyes in his eyes so he's still at fault at that- something that plays a huge part to kanghee's insecurities now. none of what seonjae was best cause if there was, they wouldnt be doing this push and pull scenarios. it was his responsibility, but he did deserve to be cheated on. they were both a dick. point blank period.
His insecurities aren't your responsibility babe especially if you did your best to make him feel secured. It's time he got help for his insecurity