Thank you for your response. I am not sure that co-parenting is the path for us to take (for many reasons) and it is not a choice that just the two of us could make - there (obviously) is a husband/father involved in all this too. I will not say "never" but I doubtful that would be a path we chose to take. This type of relationship is new to all three of us - none of us have ever experienced anything like this - and I think that we have all decided to that it is best for us to take small steps so we can all adjust to, and examine, how those steps affect us. I have yet to even meet her husband and that is something that is coming...but again, taking it slow - no need to rush.
Thank you for the kind and complimentary words in your response.