Character is really about relationships. It's about how people interact and the behaviors we expect from one another. Consequently, a character failure almost always fractures a relationship. The results can be devastating, and you may never get an opportunity to restore the relationship.
This is especially true when poor character violates a person's trust. Trust is a character issue. To be trustworthy, people have to demonstrate many character qualities, including loyalty, truthfulness, and sincerity. It takes a long time to rebuild trust once it is damaged, and you may never enjoy the same level of trust again.
"Character is much easier kept than recovered." —Thomas Paine