Humans are flawed. The sooner one realizes this, the less pain they will endure in their life. No one is exempt, not your loved ones, not your colleagues, not your friends, not even yourself. Now and then, they will all let you down. You will let yourself down.
This is the nature of humanity. We cannot escape this. Accept it. We make mistakes, and we learn lessons. Don’t be hard on them. Don’t be hard on yourself.
Many a time, the only rational explanation is the irrational flaws in humans. The story is incomplete because you assume a rational being in a situation when in reality the irrational does all the work with all their flaws.
There is no one righteous, not even one.