My ex and I split over 2yrs ago now after he had an affair. He is still with thecoerson he had an affair with. Despite this I have tried very hard to stay focused on what was best for my kids and not allow them to be caught up in the middle of things. Unfortunately my ex cannot seem to communicate or play fair. He went on holiday/away for weekends left right and centre, and it feels like I am just left to pick up the pieces, when his childcare day doesn't suit his plans. Recently he's also reduced his financial contribution with no communication with me. My kids are older 18yrs and 15yrs. I take nothing to do with comms between the oldest and him but I feel like an irresponsible parent with my ex not communicating to do what's best for our son. Just today my son has told me he can't go to his dads tomorrow as it doesn't suit. I feel so angry that he can treat me like this but feel stuck to accommodate to do whats right for my son. I have tried talking to my ex several times in the past, but the behaviour never changes. I don't know what else to do, but am sick of the impact he has on my life and my mental health.