Trust is to me, paramount. If you must discredit everything one has to offer due to the possibility they are lying to you, what on earth are you doing with them? Are they just lovely to have sitting in your kitchen? Would you trust them with your kids, belongings, house, pets?
I met a woman once whom I thought could be a dear friend. It turned out she was a documented Pathological liar. This was heartbreaking. I had to walk away from a woman who felt like the sister I never had because I couldn’t be sure of a single thing she said. She’d open her mouth and I was already halfway down some rabbit hole. Keep that up? To what end? that’s not a friendship. Its a study in dysfunction and futility. How much of a martyr are you willing to be?