We have a WhatsApp group chat I set up years ago when ex and I were still together, primarily to share photos of the DC. In the group now is me, ex, my mum, and ex's parents.
It is still used for the purpose of sharing photos and being as I do 90% of the parenting I am usually the one who shares them, and I know everyone appreciates seeing them, including my ex. I have posted on here several times about how ex makes minimal effort with the DC.
The issue I have now is that my ex and his mum often use the chat now for completely irrelevant stuff, ex will use it to talk about work quite often. Ex also goes on and on about how he misses the DC so the grandparents feel sorry for him, but then he won't make the effort to see them, and won't reply to my messages to arrange contact.
And yesterday I shared a video into the chat of DC1 dancing and singing and being silly, ex has replied today saying how much he misses them "please tell them I miss them" etc. as it happens my mum has the DC tonight for a sleepover, she made a video and sent it to the chat of them saying "we love and miss you daddy" etc.
Am I overreacting to feel this is a bit of a slap in the face. Ex has them maybe 3 nights in 21, my mum will have them for an occasional sleepover. I am very close to just leaving the group chat but then that will get everyone flustered and chatting amongst themselves. I feel quite angry atm and feel like my mum is enabling ex's useless behaviour. AIBU?