Whenever Ainz saw Albedo or heard her express her love for him, Ainz would be reminded of how he carelessly edited Albedo's setting. When the server was about to shut down, Ainz modified Albedo's 'character setting' to be deeply in love with Momonga——who was Ainz. Back then he didn’t know he would be transported into this unknown, alternate world, he only intended to pull a little joke at the very end.
A person like him.