In short, split with ex 4 years ago, we have a daughter together who is 6 and the last 2 1/2 years has been really difficult, We've both moved on, and when my ex moved on with someone new, I expected things to improve between us as parents, i.e. co-parent and communicate only about our daughter and be on the same page, instead its got worse. We share our daughter 50/50 and have done since the split. I've never let me daughter down, always offered to have her when her mum couldn't and a very hands on parent. I understand when we split it wasn't great, a lot of hurt and everything, but looking at the situation now looking back, after we split, for a good 15-16 months we got on after the split, we communicated well as it should be co-parenting. then once she got with someone new, she seemed to change overnight and became very difficult. But not where you expect it to settle down after a bit, it just got progressively worse. Over the last 2 1/2 years, we had a variety of arguments and everyone of them have been about me raising issues about my daughter, if something has happened in her care, why, medical stuff, stuff I was left to deal with and her mum didn't seem interested. but when I raised it, i was told i'm just having a go and my point was, well I'm not, its happened and I'm asking why you don't want to be part of sorting this out? We tend to argue now everyone month or two when something happens with our daughter that I need to raise and it turns into a slanging match and becomes toxic. She doesn't seem to realise that i'm just trying to do the best for my daughter, I just want to be able to get on with her, because at the same time, we've put our daughter through this break up, living in two different surroundings each week, my daughter gets anxiety at times, she's terrified about upsetting either one of us, she knows that we don't speak, she knows her mums family don't acknowledge me on pick ups etc, but my family do with her mum, as they know its the right thing to do, respect and also for my daughters sake. Plus I don't want to go down her route of behaviour as it doesn't set the right example to our daughter. But like I said it seems to be getting worse and its like I'm banging my head against a wall. I don't want her to be civil for my sake, but for her daughters sake. With time I thought things would be civil at this point but there not. Any suggestions??