Cheating girlfriend

Right out of high school, when I was thinking of going to college, I moved in with the girl I was dating. Her name was Rebecca, and she had moved to Oakland from Georgia. Things were fine at first, but then she started getting distant. One day she told me she was going to a party with a friend. I stayed at home and watched television all night, thinking things were fine. When she came home she confessed that she had actually gone out with another man and they had gone back to his place. She told me with such a blank look on her face that I knew it was over. The next day I began to pack up my things and move back in with my dad.