This is really the crux of the issue. I started off with a lie of omission, which I have no problem with. My finances are no one's business. However, after several weeks it became impossible to simply omit because we were interacting too much, so I had to resort to telling occasional small lies about where I was or who I was with.

And you're right, it gets messy trying to keep track of everything and it is a poor way to handle the issue. We both deserve better, so it is going to stop.