I have come to firmly believe that it is impossible to be a good family member, friend, partner, or colleague if your default position is to assume or believe the worst in others. If effective leadership eludes you, maybe check your heart.
On the flip side, if you keep assuming the best about someone who consistently injures you or others, you have a different issue altogether. I’m not suggesting self-imposed naïveté or becoming a human doormat.
Can or should anyone truly believe in you if you demonstrate a lack of care for and belief in others?