Oh, and thank you also sansouci for your sympathy and good wishes for our future.
Fortunately, daddy and I are friends and looking forward to his visit next week.
I appretiate your comment about a child torn between mum and dad, but in this case the alternative would have been worse: a deeply unhappy mum. Obviously a very hard descision to make, took a long time where I tried to stay, not to tear DD and daddy apart... but nearly tore myself apart in the process. Although I tried to be brave and not show DD my distress and sadness, of course she noticed (as they do) and started to worry about and comment on me being happy or sad. That is not for a 2 year old to do!
I dont believe in staying for the childrens sake -- sometimes, that is worse for them, which I have experienced through my friends. I am so sorry, though, for DD and new baby, that this happened. It was not what I wished for any of us...