Trust

How do you learn to trust somebody who lied to you so many times before? Can you trust them? How is trust re-earned? Even though I am good at detecting lies, I hate having to do it. I want people to be honest with me. I also don't want to keep having to be dishonest to people in an attempt to protect them. That always seems to backfire too. But anyway, I was just putting these thoughts out there. If anyone's reading and has an opinion on this...I'm all ears.