Longer term issue with girlfriend

Hello Everyone,
Before I get into my specific issue, I'd like to give an overview of who I am as it may give some context.

I am 33 years old, highly ambitious and quite successful in life overall given my age. I take care of my health and I am quite strict about who surrounds me to avoid bringing negative experiences, drama, and unnecessary disruption into my life. Of course it isn't 100% possible, but it helps maximize the peace in my life. People often come to me or lean on me when they have their issues as I am quite level headed, strong willed, and very often positive even when circumstances seem very bleak. I would say my social skills are quite good as I have no problem with social interaction and reading deeper in between interpersonal relationships and navigating them in all aspects of life.

I've been in a relationship with a woman for about 6 years. Major issues started to occur at the 4 year mark or so. She had confessed that she had an affair with her colleague. When I asked her more details about why and what she was thinking, she really wouldn't explain. I could tell there was more to the story. But, at the time she told me that there was nothing else. I knew she had lied to me and so I told her that the only way to resolve issues this big would be to be totally honest and that drawing them out over a longer period of time would just make things irreversibly broken. She acknowledged.

Of course, there was more that came out over time. One of the things she told me was that she planned on hiding it, but told me as sort of revenge for me coming home late from work one day as she was suspicious of why I came home. But, she never actually talked to me about that before then. Over time more things came out, but she never fully told me the story.

We split up for awhile as there was a lot of fighting about the subject, because the issue of not knowing the brutal truth behind it bothers me. I know I can handle it. She knows me well enough to know that I'd rather be told hard truths than be lied to. In this sense, I am very pragmatic and level headed. During the time these issues started, we were planning on getting married. So, this is basically the only reason I did not throw everything away.

We've gotten back together and have discussed dishonesty, selfish behavior, and so forth. Yet, very recently, she lied to me about something stupid and harmless. The problem now is that I feel she is completely untrustworthy. From my point of view, if you compromise your character over small and meaningless things, you'll do it for anything. Each time we have a conversation, she tends to ignore my side or the things that are important to me and turn the conversation around and somehow make it seem like I am the one doing something wrong. It is unbelievable. She admits making mistakes and claims she is working to resolve them, but I simply do not see the actual changes to give me any confidence in having a real future together. I have zero trust in her and most of all, the fact that she hides the truth about why she cheated on me still bothers me more than anything.

As I mentioned, mostly people come to me for advice, I do not think I have anyone in my personal life to confide in. So, before I make a major decision, I am coming here. I'd like to have a family one day. Whoever I have a family with should share my values. At the same time, certain things are fundamentally dooming a relationship to failure.

What are your thoughts?

Thanks for any insights you all may give.