question

Why do people lie to each other like you can just tell the truth this way or another they will find out you are lying, and imagine you are the person who is being lied to, I understand if it's a birthday surprise or a gift, but to lie about opinions if people dissagree on many issues leading to lies why stay in such a relationship based on lies? I am curious about your opinions on lies, sometimes I catch myself lying people just to watch their reactions, whether they believe in them or not It is not like big and moments later I tell the truth but why do I do it ? Idk┐(‘～`;)┌