Sweetie, I hope you dont mind me saying that I dont think its a good idea for you to check on him on facebook. Really, what purpose does it serve for you?
I know that you think that it will help you move on, but, really, right now I dont think its a good idea.
That said, I agree with Snodderly, the high road is always the best one.
So, I think your email back was perfect. Who cares what he thinks about it? Trust me that he knows you are not completely detached. They can sense it when it's true.
I think you should think about not looking at his facebook for now.
And as for how he looks in comparison to her, I am now surprised. He is fighting many demons. Some he doesnt even realize. It takes a toll.