When my ex partner who is in his 40s left me 6 months ago for only reason as wasn’t happy as we bickered due to not being able to see each other much due to work he worked nights 6-2am I worked mon-fri days So he only seen children 1hour after school to me he seemed to turn very selfish nights out drinking every week which he never done, mini breaks to Benidorm with mates, never took children anywhere started dating someone 2 months later which he has stopped working as much to spend time with and then I get the backlash as he wants to pick children up later so wants to give a few hours up with his set days and times and when I say no he gets so nasty with me. Apart from that he seems very angry and bitter in general even though he was the one that left me. I’m not sure if it’s because he is having children more and making less money annd trying to fit new partner in and takes his frustration out on me. I can’t see that his life has improved apart from a new partner and I am trying not to fixate on his life even though I am heart broken so doing therapy but just don’t get the angriness and coldness to me. He tells me to stick to set days and times which I do and he doesn’t but when he asks to change and I reply stick to days and times he tells me he never wants to speak to me doesn’t have to and doesn’t need to get along yet every week he is wanting to change pick up and drop off times so then gets back in touch. I can’t understand why he says these nasty things yet he left me