My ex had a go at me tonight out of nowhere because "it's not okay" that I don't contact his mom and make arrangements with her for her to have our 6yo son. He says that because I used to do it I'm out of order for now saying that he should make the arrangements. I work full time and am a single mum to 2 kids and frankly don't have the head space to take on facilitating a relationship between my son and his grandma just to make my ex's life easier, which I told my ex months ago. AIBU to say that he needs to take responsibility for this?