No need to apologize. I ask myself the same questions, and your comments gave me pause to reply with a well-thought answer which I felt good about.
I have continued to chat with W twice a day while she is on her vacation with OM. It's impossible to manage phone calls with a 1 yr old without some adult intervention, and I'm sure if we didn't speak, S4 would wonder why. It's part of the new paradigm, I suppose.
Like BBUd, I'd be interested in knowing more about your split and eventual reconciliation. How do we find out?