A lie is intentional misleading and a betrayal. The dictionary defines it to make an untrue statement with intent to deceive. A lie is not merely a mistake in facts; intent plays a role.
Have you ever heard it said that lying is difficult because one has to remember all the particulars leading up to that conclusion in the lie? When I was young I heard this quite a number of times. I remember thinking to myself that I will be able to remember all the particulars as needed; I also remember that first time I started having difficulty remembering! One fellow said, “One ought to have a good memory when he has told a lie” (Corneille).
Lying is also a breaking of trust. Not only is it the refusal to tell the truth, it is also an action in the direction of the other person that there is no trust. It’s another way of saying that “I can’t trust you with the truth—so I will lie!” If you have lied to a loved one, then they know what this means! The door is open to a lack of trust thereafter. RT