I need to know how he got his memories back (anyone please do spoil)

me tooooo

Me tol pls

I read the novel awhile ago but I think a flood happens and after getting mc to safety he gets pushed away and hits his head on a rock

SPOILER





So when he finds out he turns abusive and abandones the fl apparently i hoped he would stay how he is but ig not. He thinks she betrayed his mother and he psychologically abuses her