So sorry for your pain Chloe; this truly sucks.
I cannot believe that she posted something to your Facebook page outing not just the affair but acknowledging what a low life tramp she is! Is she married? It is always a good practice to tell the other betrayed spouse if the OP is married. This gives you two sets of eyes watching their behavior.
Also, if you haven't already, check out the Healing Library to the upper left side of your screen. Many, many stories from those of us who have been in your shoes.
Take your time and see how you feel. You have been great so far, asking him to leave was smart. It shows him you are serious and hopefully will give you a little peace as well. Remember, you didn't cause this and you can't fix it. That is all on him. Don't feel bad for loving him, that's what wives do; it's not that easy to turn it off so quickly.