"Admit when you're wrong. Shut up when you're right." -John Gottman (This man knows a LOT about what helps - and what hurts - relationships. He's done tons of research on it, read his stuff it's amazing.
Stay strong and remain kind. I allowed anger and resentments of the arrogant to take my kindness from me. I'm just now learning to regain that inside me, which makes me a much better version of the real me! Never allow anyone to dull your shine!