So a bit of back story to this..
DP and ex had a fairly messy brake up and their DD was only a small baby. They have a mutual agreement to share DD.
I met DP when (now my) DSD was just under 1. So I've known her and looked after her for over a year. She is now nearly 3.
DP and I now live together and have a DS( 5 months old).
Now the problem..
DP agreed to have DSD this weekend before he'd got his work rota, and he has now had to work this weekend. This left me on my own for 2 full days with DSD and DS. This isn't usually a problem and I don't mind as DSD is normally a lovely and sweet little girl.
But
Today she has been nasty, and generally awfully behaved. She has screamed and cried at everything, she's thrown food around and just been a terror.
So I asked DP to take her home tonight then I didn't have to have her all day tomorrow too.
DP is now saying I'm not being fair and I'm unreasonable for not wanting to look after her tomorrow.
AIBU or is he?