[downerending]

Looking on Amazon, I think it was probably one of Edward O. Wilson's books. Probably "Sociobiology: The New Synthesis".

I was particularly struck by the typical behaviors of mates in primitive societies, and especially patterns that indicated a partner was unhappy in a relationship and/or trying to get rid of their mate.

We're not so far away from those that came before.

[tomasdore]

Thanks for replying with the potential book title! I'll take a look at it!