I'm an avid reader of this board being a step-mum myself and it seems that a lot of issues stem from exes expecting co-parenting to be more like a co-dependency relationship?
I talk from experience as the first 12-24 months of DP & I's relationship was hard because of this and setting boundaries in place with the ex wife. My DP really wanted to establish a good co-parenting relationship at the start but his expectations & his ex wife's expectations of what this looked like were very different.
For example, ex wife would ring him in the evenings wanting him to fix issues with plumbing, installing new appliances, would ring him during his DD's contact days less than 24 hours into him having his daughter checking if she was ok, wanting to meet in person over a coffee at the start of every school hols to discuss arrangements, and do all present shopping for DD together, invite him over to her family BBQs and give him attitude when he declined, expecting DP to come rushing over to check she was ok after a minor car accident (when she didn't have DD & no hospital admission) etc etc. My DP felt all this was an invasion of his privacy and our privacy together. The ex wife had gotten into the habit of ringing him for every single detail/plan instead of dropping him a text/email. When he didn't answer it was met with 'I am the mother to your child and you will answer me'.
My DP's idea of co-parenting was more of keeping each other informed of anything important in DD's life and sharing the same views on discipline etc, informing each other of change of contact if needed, medical appointments, school etc etc. In his view this would mean that sometimes days, even weeks could pass as DD grew without needing any contact (she was 5 at the time of split). He tried to express this many times to ex wife but she would still ring him daily. Some days if he hadn't replied to a text within 30 minutes she would either call/text again asking why he hadn't responded and chasing him.
Fast forward 4 years and sadly this has now led to them having an almost non-existent relationship between the two of them as it had become so toxic trying to agree on how was best to communicate. Tbh it can be a massive pain when we need to try and change simple plans and the worry of what might happen. I'd much rather things could be more civil. I can't really blame DP here as he did try. I'm not sure how much more he could have put up with if I'm honest. It was really bad at one point (we are talking 5 missed calls & 10 texts in the space of an hour as he hadn't replied. This was a year into them being divorced).
Anyways I'm rambling now and not sure what I'm asking here. But has any other step-mum's out there thought the same thing about all this in terms of co-parenting and co-dependency of the ex wife? Is it possible to establish a good co-parenting relationship much further down the line???