As long as she thought I was clueless, I was ok. Once I began confronting her with her lies-I was history.
Rephrasing this based on my experience with my ex:
As long as she thought "things were clean with me" (her dirty past was forgiven and forgotten, her present lies and manipulations not caught, her future safe, she can control me, i will love her the way her fantasy works) and she could keep chasing me and seducing me (without me realizing this), I was OK

. Once I began confronting her with her lies and "things became dirty" (to quote her), she couldn't envision the fantasy romantic love with me anymore. I was soon made history.
If you break down the walls and try and achieve true intimacy (honesty, mutual respect, sustained mature love, mutual care) then it becomes "dirty" for an HPD (they are exposed) and then they take flight. For them to be with you, you have to keep up the pretense of "infatuated love" (forget honesty, superficially respect them inspite of betrayals, show infatuated love, care only for them) and then do it some more by letting them chase you and seduce you (the excitement to ward off getting bored) - only then will they remain with you, show superficial love and affection for you (seduce you) and feel alive.
For me the choice was between:
Centering my whole life around this game - its a full time job (you have to turn pro) - playing the game by giving up all my other goals in life.
OR
Concentrating on my goals in life by choosing to have my peace of mind by finding an "appropriate" person who can reciprocate my feelings without so much effort, energy and the need to constantly play a "game".
I had finally gone NC and chosen to lose such a game where the "prize" is not worth the effort. Love, relationship and marriage couldn't have been a "game" for me in the long run. I am a real person and I can't turn my life into a game (or a drama on a stage) - I want a real relationship, whenever it comes.
She got married a month ago (found a replacement source behind my back during the last stages of our relationship and proposed in a week, got engaged in a month and married in 3 months). I wish this new guy (her husband) all the best in managing a game that can only be lost, unless she takes my parting advice and goes to therapy.