if it was a thing that meant nothing then don't poke at it, let it go. " But if there are real feelings then give it a chance. The act was done and you can't go back. Just whatever you both do, try not hurt that third person even more. You can totally damage her by going all wrong about this. Well you already did but try to not make it permanent. As for those feelings of guilt, take a conscious decision of what to do next and live with that. Then let go of what is not in your hands to change.
you should do.
if it was a thing that meant nothing then don't poke at it, let it go. " But if there are real feelings then give it a chance. The act was done and you can't go back. Just whatever you both do, try not hurt that third person even more. You can totally damage her by going all wrong about this. Well you already did but try to not make it permanent. As for those feelings of guilt, take a conscious decision of what to do next and live with that. Then let go of what is not in your hands to change.