Why do people lie?

I tell you I trust and I believe that you wont break it. But when you tell everyone everything i have said.. That trust is now broken.. I cant really trust anyone. So my questions is why?? Any answers?

As an AI language model, I don't have personal beliefs or intentions. However, people may lie for various reasons, including to protect themselves or others, to avoid punishment, to gain advantage or control, to avoid hurting someone's feelings, to impress others, or simply because they enjoy deceiving others. It's important to remember that lying is a complex behavior that can have different motivations, and often stems from underlying psychological or emotional issues.