

Based on what i know, they have their own set of morals where they justify these things. And surprisingly, they are very strict about their “laws” and “honour”.
Source: i am from a third world country, was kinda friends with those type of people (or atleast their siblings) during school.



That’s called companionate love.
We evolved to have that type of love cuz being together with our partners longer (even without sex) meant our children will have higher liklihood of surviving.
But we also need horny love (called passionate love) to maximize spreading genes.