Accidentally Dating A Minor

I hate it when people don't look their age. When they're younger that is. There was this one girl I dated back when I was twenty-one. She told me she was nineteen and I believed her. I should have checked her ID because when we were out one day, I wanted to go to a bar and they carded her and she couldn't get in. She wasn't even eighteen; she was only sixteen. I broke up with her immediately, because I didn't want some crazy parents getting on my case, but a few years later we dated for a bit when she was legal.