Yes and if there’s bad feeling involved (which there obviously is on both sides) why should he have to effectively clear it with her first?!
So many double standards out there. People are told time and time again on here that what their exes do / who they let the children meet during their own time is up to them - including meeting a new girlfriend/ boyfriend for the first time, but he’s not allowed to post a photo on social media without ringing his ex - who has been vile to him on social media - to effectively ask her permission first? Madness.
The majority of posts on Mumsnet that I have seen over the years that relate to this sort of situation, actually seem to veer on the side of admonishing posters for moving in too quickly with the new partner especially when it involves DC.
And it's not just a case of clearing the photo with her is it, although that would have been decent of him in the circumstances - she may have been a little more prepared rather than blindsided - and her reaction may have been more measured. It's the fact that the new relationship was allegedly confirmed publicly by the photo and all that that (allegedly) implies.
I personally think it is inhuman and cruel to be married to someone for twenty years with whom you share DC, and then not to speak to them properly if you feel the relationship is no longer sustainable on your part. Especially if your DP or spouse has an entirely different view of things and is perhaps hoping for a reconciliation. Again, just to be clear, we do not know the exact circumstances of what happened in this particular instance but that is what AE has alleged , we do not know if it is true or not.