This is the thing, every single problem, they always blame the guy who has nothing to do with anything. It's the same as those two mangas I read. One has similar introduction as this, the guy got traumatized because he was cheated on, and yet he gets all the hate and abuse without hearing him out. The other one is sort of new, the guy and his family received a sht ton of hate just because he talked to this girl the "narcissist" has a crush on.
I'm sorry about this but relationships like these are the worst ones that get me annoyed. They're not communicating each other, still keeping such secrets from each other (well in this case, she's the one making secrets), and then blaming him for not knowing everything that has happened. And the worst part is that the one who is responsible for such situations always gets away with it. It's pissing me off