Pretty much as per title - it has come to light (Ex DP, DD father) has been using a pretty generic pet name for both DD and the new GF.
I do not think or believe anything untoward in itself, but the fact he fully aware how she feels worthless it makes me upset he has allowed her to find out the pet name is not "special" to her.
I have lost sight of what is reasonable these days due to history of abuse (from him and spilling out to being witnessed by the children), and a recent death in the family has me barely able to function past faking it for the children. DD has medical diagnosis which leads to life being more complex for her than most.
I made clear the issues DD has as set out by NHS including anxiety and self destructive behaviours and how fragile she is - yet this has happened and I am tired of defending him in effort to minimise the damage as this affects our relationship also. I want to just break contact, but never sure if for the best as she wants him in her life despite the damage/upset it causes.
For my DS (older and remembers more) he would happily move away and cease contact with his dad. He has said this on more than one occasion. DD still wants her dad to be her dad.
Am i being unreasonable to see this as a massively disrespectful (the calling them by the same pet name), and to defend DD as an advocate - as she is just refusing to look at her messages from him for the past few days and being teary/not eating (she is upset, but in a silent, but disappointed way but it comes out in withdrawal from day to day life) or am I unreasonable to pull him up on allowing a situation to occur where DD is left upset and set an ultimatum of not happening again and to move contact supervised?
I do want to highlight again she is more fragile than most children her age, and think this is potentially adding to my feelings as I try so hard to get the balance right of being present and advocating without taking over and allowing my feelings to cloud anything