The second of the Yamas is Satya/Truthfulness.
Being truthful is about more than just not lying.
It isnt easy to look at yourself closely and own up to your own limitations. The limitations that can lead to dishonest behaviors. When someone says something that upsets you, notice your reaction. Recognize how you really feel vs how you react. Do your best to not gossip, manipulate, or cheat. Being honest is the goal, but practice ahimsa when telling the truth.
"Right communication through speech, writings, gestures, and actions." - the yoga sutras of patanjali, II.30