She left me for another guy, now wants to come back?

andy21918
My girlfriend of 3 years said she felt we are growing apart and wanted to break up I went to my moms for the weekend a few hours away and when I came back she had been talking to a guy she had a crush on in high school. She took all her stuff and went with him. Now she says he used her. They had sex and he stopped talking to her the next day. This is all within the last 2 weeks. Now she says she made a mistake and wants to come back. If I do will she do this again? This is very out of character for her. She is very modest and not very sexual. She realizes that I'm the only one for her and please forgive her. What should I do. Do you think this will happen again?
She left me for another guy, now wants to come back?
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