I was a master liar in my teenaged years.
I regularly lied and manipulated situations to benefit me. Lying came so naturally I never had to even think on it, I even regularly made up lies for my friends to get them out of trouble... and no, it wasn't always petty, I once lied (and convinced 2 friends to do so as well) to avoid getting a criminal record too...
Then one day (idk when or why exactly) I decided fk it. I want people to like me because they want to, I want people to care or do things or give me things because they want to. Not because I make them believe that they want to... yes I was that good.
My method?
To simply tell the truth, even after lying.
"No mom I don't smoke weed, actually that's a bloody lie mom, I'm high right now. Sorry"
Yep, that's what I did, the shame of confessing made the truth come out more naturally.
Nowadays?
I'm honest to a fault. Lol, but that's BPD for ya, not much natural middleground for me to work with.
So while idk if this liar liar pants on fire gig was a gift of my BPD (although it served my BPD needs well) I do know that its not an issue for me at all these days. It was more of a well paying bad habit that I chose to break.