It all begins with the little white lie ....
Okies so what happens if she says no more Steve because it is causing issues between the relationship. When she's late or when she doesn't arrive when she's supposed to. What's most likely gonna pop in your head? Yeah that : Where's she's been/doing/with/etc etc.
Seems like you want to work things out, but you are constantly getting the slap in the face with lies.
With the track record, this girl is as trustable as Michael Jackson is to little children...
Just remember, actions speak louder than words, and how are her actions?

My ex did something like that to me, lies after lies after lies; nowadays we're civil to each other but I don't believe a word she says ever... The trust is gone... gone gone gone.. like the time I wasted with her...
I think only you would know if you have it in you to go through this again, and if this time if she's genuine...
Best of luck.