ExDP and I have 5 year old DS together.
We split when DS was a baby and he's been a bit of a dick ever since. He is meant to have him two nights per week, but his parents do one of those and when it's his (week) day, he always drops DS off early around 2-3pm, instead of spending the day with him. So spends less than 24 hours per week with him.
He told me that he was going on holiday for two weeks, his parents will cover his day whilst he's gone. Fine. He is meant to be back on Saturday, but it turns out he is now staying for an extra two weeks. So will have been gone for a month in total.
He told DS he was working in London, DS is really missing him.
AIBU to be pissed off he's gone away for a month? Perhaps I am, I just feel bad for DS.