Honesty.
Whether it be being true to myself, standing up for what I believe is right or simply by addressing someone with it. I’ve lost so many important people in my life because of lack of this simple trait. I regret it so bad. Moving forward from it I’ve learned the lesson. I know now that trying to patch up a relationship with lies in the fear of hurting someone is not the way to go about things. Just confront the situation with 100% honesty.