Hi OCD1972

Thank you for sharing your story.

I think, when the lies are not hurting others, it might be acceptable to some degree.
When the liar is targetting the lies as waepons to hurt others so they do what the liar needs/wants to be done, it is very different.

And, at least, he left you a confession that shows that he had some understanding of his condition. Maybe in the expectation of death such insights can come?

Without the lover of my wife being respectless to the rest of the family, she would not have managed to chase me away and most likely I still would not be aware about mythomania and fight fruitless fights about almost anything.

I believe that as long as the partner has a tiny bit of affection and maybe even love for the liear, it is near to impossible to become aware of the situation (at least without external help.)
Best wishes
David