You know what, Rosa, it's nice to see you have that in you. LOL!
My friend, while the advice here is to not do anything to help end an affair, I dont think you messed anything up. Look, you reacted to something very upsetting. It happens.
I do not think you should contact her or apologize to her (sorry, FY), because she is not worthy of it. If you do, it gives her importance, of which she has none.
So, dust yourself off and get back on your path with your head held high. I think you should walk around with a different mindset. Like, yea, that's right, back the heck way up cuz I am Rosa.
Now leave this all to settle in. And then pull up a chair with some wine and popcorn.