Rob - I still don't believe there is another man in her life at this point. Although, that would be the one thing that would make her leave her kids. Regardless,there could be at any time. And if a man shows later, I will likely never know when he was first in the picture.
As for the living my life without her, you are correct. It's time to do so. I am not the kind of person to throw a party, but I get the idea. Really, I have no choice but to live without her and I can do that sadly or as happily as possible. Those are my choices.