Tips from evolutionary psychology:

The more estrangements someone has in life, the worse his or her life is – across the board

If you trespass against someone in your world, realize that forgiveness is not an easy feat and it is actually rarely truly implemented – especially if the transgression is major and personal

Developing a reputation as someone who is genuinely trustworthy within a small community is golden

Source: What’s the Darwinian Recipe for a Fulfilling Life? 14 Questions with Evolutionary Psychologist Glenn Geher (PhD)