My DD's nan had a bitter breakup with DD's biological grandfather many years ago and still carries the resentment and bitterness.
My DD's dad and I split up 4 months ago when DD was 2 months old. We had a very loving relationship before we split. Since then, DD's dad has become extremely cold with me and I feel it's mainly coming through advice from his mother.
An example of what she's like: I told her I might have to relocate 90 miles away so as to afford living costs and explained that I will discuss it with DD's dad as his feelings matter as does his relationship with DD. Her advice was to not tell him and to just move away. She knows how much this will hurt her son yet advised it anyway.
There's been other things that she's said and ways that he's behaved that are not part of his character that make me believe she is playing us off against each other. I find her attitude is somewhat toxic due to her resentment to my ex's dad (she's been happily married to someone else for years yet still sits there seething over her ex).
My poor DD is going to suffer and I feel we will no longer be coparenting as things have become so cold. I don't know how to cope with it and it's really getting me down. Any advice will be greatly appreciated.