I slept with my friends GF?

Anonymous
So, about a couple of weeks ago me and my friend went to visit his girlfriend for her birthday. I have had feelings for this girl for a long time and have never told her. Any way my friend had forgotten his present for her she he went back to get. His girlfriend went upstairs to get ready to go out and left me downstairs thinking about the situation. I decided I should tell her how I felt. She told me she had felt the same and we started kissing. One thing led to another and we had sex. We have been seeing each other behind my friends back ever since. What should I do?
I slept with my friends GF?
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