Originally Posted by
Down not Out 
Oh I forgot to add that she deferred sorting out the separation agreement until our next meeting!
I'm sorry to say this, but it sounds like she's using you. What stops her from having both you and him? It sounds like she can if she wants to and she wants to and you are allowing this to happen.
If I were you I would get my lawyer involved and get the seperatation agreement formally finalised. I would look for all clauses for full custody of the kid (since it doesn't look like she has the capacity to look after the kid in her current state) and if achievable get as far away from her as posible while she makes up her mind.