ExH usually has kids on weekend. He's going fishing so asked a few days ago if he could swap his nights from Fri and Sat to Tuesday and Wed. No problem, I said yes.
Because of this I booked tickets for the cinema tonight and told my gf we would go for lunch.
ExH messages last night asking to change nights to Wed and Thur as he needs to finish a job he started yesterday.
He says he will reimburse me for cinema tickets.
AIBU to just say no? I haven't told my GF yet, she's going to be pissed off, she's looking forwards to our date.