I have 2 children with my ex partner who stay with me 2 days a week I had let me ex partner know in January that I was on holiday at the end of May for a week meaning I wouldn’t have the children for one of the days, at the time this was ok as she was due a holiday with her new partner and the dates were discussed but her holiday didn’t happen, and now she is saying that I am abandoning my children , What should I do or say ?