There is not much one can do if their partner is a pathological liar. Pathological liars know they are liars, but cannot seem to find a way of breaking this bad habit. Often pathological liars have low self esteem and can dramatize certain scenario's to make themselves seem self important and while this may work for a little while it does not fool many people. Pathological liars also have a difficult time in relationships and will lie about simple things they have done and will not own up to it. You can either put up with a partner who is a pathological liar or leave the relationship and the latter is the best way to go because you will find it difficult to believe them and once lied too it breaks the bond of trust between the two people and the relationship will eventually end.