<human>: I know for a fact that she cheated on me. She doesn't know I know. So this morning I told her that I was bothered by something and I asked her about that guy, telling her my gut feeling was bad about him & her, and that I know it may not be rational and I just asked her if anything I should be concerned about. And then she lied and said no, nothing going on (there is, I know from the guy / her texting)

Obviously I'm gonna break up with her as she cheated and lied. 

Fwiw this girl has had made firm plans to move across the country with me for my new job. She's ended her lease & put in a work transfer... Clearly willing to uproot her entire life to be with me!! I've met her family, friends (including this guy), gone on vacation, etc. Yet then she cheated and lied! Is there any understanding this?

Condense the text into a few key points
<bot>: girlfriend is willing to move across country with me yet also willing to cheat and lie to me. How can I make sense of her actions?