I am assuming she knows....they text each other, and I am sure people talk, and I can't imagine she would go for it knowing he was still engaged. As for a rebound I have thought that also, but I think he left Wendy a long time ago. He was not that disappointed that she left him, and he was only going to give it another try I think because he felt guilty for having an emotional connection to Kim. Now I do not know how the writers will tackle this, but I am excited about the stories they could have together.