How do I choose between a guy and my best friend?

Dear Darcy, 

I ended up sleeping with my best friend’s ex and now she hates me… 

A couple of weeks before I did it I asked her hypothetically if it would be okay and she said no, however, when I [slept with him] she and I were having severe problems and I saw her ex as more my friend than as her ex. He was very close to me at the time and I had feelings for him and I acted on them. I regret what I did and now I have to choose between him and her and I’m not sure that I can do that… what do I do?

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