There is a difference between being honest, or truthful, and being accurate.
Accuracy alone, while important in certain essential facts like birthdates and college degrees, can be the kiss of death in a memoir.
Why? Because you are a human being, not a recording machine. You have a soul that interprets events, molding them into your own personal truth that is expressed in a way only you can express it. That subjectivity is what makes a memoir interesting. You are showing your reader what it feels like to be you.