DH generally sees DSS on Saturday's while it's his sports season. Takes DSS to his game then they hang out. Easy pattern has formed. This weekend we going away, DSS still hasn't told DSS or his mum that he won't be about. His reason, I'm busy/stressed, I'll get to it. I think his reason is he doesn't want Ex and DSS kicking off because he is choosing to go away with me and not including DSS.
So he's trying to avoid the issue.
AIBU to think it's shitty behaviour, with notice this could have been handled with easy. If I was ex I would have assumed this would be happening and would be annoyed to get let down at last minute....