People who have been cheated on, what signs did you ignore that now seem completely obvious looking back?

A long time ago, I had a girlfriend that got a very high cell phone bill to the tune of $400 something dollars. I asked to see her bill so I could help her figure out why it was so high. She flat out refused. I thought nothing of it until a few weeks later she called me to come help her get home. She said she was hanging with a coworker that lived near our home. That was the first red flag. When I asked her where she was lost, it was a place that was roughly an hour drive from us. Turns out she was truthful to some extent, she was hanging with a coworker. Not the one she said she was, but one she had a crush on that lived an hour up the interstate from us. I didn't know this for certain until she had a falling out with her best friend, who then told me what was going on.

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