I don't think I have ever straight up lied to them. I may not have brought things up or said I was going okay when I was struggling. However, T learned that for me there was an I am doing okay as in doing pretty well all things considered. Then I also have the I am okay meaning I am putting one foot in front of the other I am pulling through even though I am struggling. She learned to ask more questions based on my facial expressions and body language. I dont consider it a lie though. I may answer something that I honestly believed was the truth and upon processing I realized I was wrong.
I have always told my T I will always answer anything truthfully. Even down to things like how much I drank since I know that in the industry it is known that most clients minimize their consumption. I may not bring up a topic but if asked I will always be honest.