Me and my ex have 2 DS’ together, they're 8 and 10. My ex had an affair and that child is now 5 he's still in a relationship with the OW and they now have a 1yo. He was meant to have our sons today but he messaged me and said he had to take the baby to the hospital and asked if I could have the 5yo. I said no and he replied ‘looks like I'll have to take him with us’ as apparently the OW is working away and the baby got injured.
Was I bu by saying no?