You can't repair serious damage easily. I think that building trust after it has been breached is a bit like getting out of credit card debt. When digging out of debt, you need to make a budget, and stick to it. Then, sacrifice all of the things you'd rather do with your money in the present, so that you can have a better future. It takes commitment and hard work. Pathologically lying, I would imagine, is like compiling a giant trust deficit, which can only be dug out of one small step at a time. If you want to fix it, you first have to identify the source of the problem (i.e. why do you lie?), then make a serious plan to correct your past wrongs. Deep problems require deep solutions.
The sad part? I know. Deep cuts require deep pain, deep lies require deep solutions. I just have no clue how to even start to mend these wounds.
Wow, that's really inspiring and helpful. Thank you.