"Probably because she's been lying about things she's been doing and who she's been doing them with since BD. "
TBH, she really doesn't owe you any explanations. She tells you things just to placate you. You see them as "lies" but in reality she just tells you something because she doesn't want to deal with you and just tells you what you want to hear.
You're at that point in the process where your fear is now changing to anger and resentment. If you're not careful it will change to unforgiveness and then you'll move on to someone else. Problem is that because you didn't spend the effort to learn and understand how your actions affected your W, you'll end up repeating the same behaviors with someone else.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.