There is certainly that (basically sexual selection) but there's also the more generalized natural selection where, for example, foraging and hunting solo are b

There is certainly that (basically sexual selection) but there's also the more generalized natural selection where, for example, foraging and hunting solo are both much more difficult to do successfully, so you inherit a social drive along the lines of "I feel anxious or depressed when I'm totally alone," and/or "I care how these other people around me feel and what they think of me."