Comment by Cinnamon__. on Tears on a Withered Flower - Chapter 69

@Cinnamon__. They don't change, in rl most men just act all nice and friendly just to get the girl, and they show their true selves, when they get too comfortable, some men shows legit love but it's kinda rare, I'm a male myself, I know how my kind thinks. 

Also the people they're surrounded with, can also affect their morals, some guys are devils.

In my point of view, humans don't change, they just evolved to fit in.