Valid and reasonable course of actions.
Blondie took Seojun for granted. As someone who stayed and assisted blondie all those 12 years, not confessing is what little pride and self respect Seojun has for himself. He was already giving hints, but blondie was too engrossed with his own ego amd self that he didn't notice.
Seojun really is stronger than me, cuz if that was mw i'd have a restraining order by now