Originally Posted by
LoveMeNow 
Maybe he is just a pathological liar.
Maybe you are "seeing" it more now that he is your ex?
Lots on the intertoobs, most fairly decent . . . . just a sample . . . .
Mythomania: Compulsive Lying Disorder | Helping Psychology Compulsive Lying Disorder Mental Health Matters
For *ours* level of dealing, figured this one spoke fairly well to it all . . .
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Compulsive Lying Disorder Compulsive lying disorder is not actually a documented psychiatric disorder. Instead, it's a term used to describe what may be a symptom of another psychiatric disorder such as borderline personality disorder, narcissism or bipolar disorder. Not all people who are compulsive liars suffer from a psychiatric illness, but there is usually an underlying reason for the behavior.