Doesn't matter if its the first. The second one is also acceptable.
There's no will to deceive, just a blatant misunderstanding on my part which I'm willing to admit. The first accepted definition of "misunderstanding" is appropriate here. The choice of "falsehood" is accusatory.
I never thoght you were lying in the first place. So now if you'll refrain from judging my motives we'll be even. But if you can't bring yourself to do that its no skin of my teeth.
Even.