I have a group of mum friends who I regularly chat with at the school gates. We have a Whatsapp chat and arrange play dates etc, I thought we were pretty good friends. A couple of nights ago me and one of the others had a difference of opinion on something, nothing angry was said, we just didn’t agree. Today she has deleted all her messages from the chat, avoided me at drop off and then I found out she was venting to my husband about “my behaviour” when he picked our daughter up last night. AIBU or is this shady behaviour?