Well, I believe that if you don't know what to do, sometimes the best thing to do is wait until you do... as long as there is no emergency looming. Eventually something will happen inside or outside of you that will make it clear what you want to do. I believe this is one of those things that you don't have to "force" a decision. It's an inherently unstable situation that wants to resolve itself. Just be open to your feelings, events, possibilities...
Does he want to get back together?
How are you and the kids doing with the separation? How were the holidays?