Long story short - I've recently fallen out with my parents. My DP knows what's happened over time and reasons leading to it, etc, and has been quietly supportive. A few days ago he told me my Mum had sent him a Facebook message asking him to 'look after' me and the kids (?! Like he hasn't been doing anyway.... 
) and to keep them updated about how we all are.
Seeing as I've stopped contact with them I was a bit pissed off by this and said I'd rather he didn't reply. He said he would feel rude if he just ignored it, but didn't know what to say so he would leave it. 2 days later I ask him if he's going to reply and he tells me he already has done.
Aibu to think he shouldn't have replied, knowing that I didn't want him to? He knows how much they have upset me but still seems to put their feelings before mine.