Why does my ex lie about the scar from when he attacked me years ago?

So almost a decade ago I defended myself when my ex-fiance was attacking me some how had the courage and try to punch his nose instead my ex move side ways some how I punch his glasses beoke the glass went throw his forhead and scar his right side eye lied he was 18 years old at the time when all this mess happend as of today he is now 32 years old and when people question Mr. FOUR-EYES about his scar history he lies to people by telling them that a witch attacked him , Instead of four eyesbtelling telling people the truth he was being a jerk, No he decided to be weid and lied about it. What would make my ex MR. FOUR EYES lie to people?

Why does my ex lie about the scar from when he attacked me years ago?
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