I hung out with my best friends ex boyfriend.... and we had sex.

I really dont know what you can do. Like this is a major trust break in the friendship and most people never recover from something like this. I dont know your friend so i dont know how she deals with things, but most people dont wouldnt want to hear you say that you love and care about them after doing something soo hurtful.

Look i dont want to assume anything but im assuming you havn't had any long term relationships or else you would understand how horrible this is. So the only thing i can advise is to just tell her why you did what you did and that you didnt understand how big of a deal it was and apologise, and hope that she forgives you. But its probably not going to be the same like she will most likely not trust you again.

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