I'll start off by saying none of the lies or changing stories have been over super important things or related to cheating or anything, but they do still bother me and make me wonder whether I should tolerate this or not. It mainly has happened during our fights/arguments, she will say "I never said that" even though she just said it 1 or 2 minutes prior, accuse me of saying things I didn't, or change her story when it's clear she was in the wrong so as to avoid responsibility. I confronted her about this once a few months ago when our relationship nearly came to an end, and she did admit that she does this. She has also changed her story or had inconsistencies with some other things though, which makes me worry. The most recent example is that she told me radically different numbers of what some of her bills were between now and six months ago despite there being no changes (same car, same apartment, no re-negotiating, etc). When I told her the numbers she told me were wildly different and that I know because I wrote them down the first time, she got defensive and said she never remembers saying anything the first time, then she said she must have just been exaggerating, which I sort of get, but the difference was huge, way past the point of what falls under exaggeration. I know she's not trying to manipulate me into giving her money because she did not ask for money or imply I needed to give her money either time, and I've told her straight up that I never would pay her bills for her. She has also contradicted herself on other things like saying she has lots of vacation time at work and she can take almost any day off then saying she can't only weeks later...
All of this has me feeling like I can't really rely on her to deliver the truth to me, whether she's making a conscious decision to lie or not, and it makes me feel like she's kind of disqualified herself from being in any kind of serious relationship if she behaves this way, but maybe I'm making too much of it? What do you think?