I once lost a friend, because I was honest and wanted to help her. She didn't appreciate it.

I keep quiet if I know my honesty will hurt people. Unless they ask and want my honest opinion.

I've only lied once when asked. My sister knew I hated cake cream made out of powder. So when she served me cake that contained cream that clearly (to me) was made out of powder, and she asked me if I liked it, I lied and said "yes".

She made a fool of me for years for not being able to taste the difference. I never told her that I lied to her.