I just had sex with my girlfriend's best friend to cheer her up?

She went through a bad breakup, her boyfriend was really abusive to her. She was crying, so I tried to cheer her up. She then wanted to me to nail her to make her feel better. We were alone, and she was hot so I went along with it. Later on, I felt like she used me and that I betrayed my girlfriend. What would you do?
 
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