Ex DP has a family do next month up in Scotland (we live in Cornwall, so quite a trek) to celebrate his gran's birthday. He mentioned this a while ago but has up until about a week ago not known what the exact date is. He wanted our DS who is 20 months old to go (with me) to this do.
However, I am a student and the date of this party is bang in the middle of extremely important end of year exams. I feel I need to focus and will be massively stressed around this time as it is without having to deal with traveling with a toddler and dealing with a load of ex's family members who I don't really know and who have never taken any interest in DS.
Basically I told ex today that I will not be able to go to this thing. He is massively angry, calling me a disgrace and selfish etc,.
As a back story he left me when I was pregnant and is generally an undermining, passive aggressive little shit who gives me a hard time constantly about the tidiness of my house, how I look after DS while being pretty feckless himself (for example leaving DS unattended in the bath a couple of weeks ago and not helping me)
I don't want to go to this stupid do. I don't feel I owe him or his family my attendance. I have important exams around that time. I don't want him to take DS on his own just because I feel he is too young to be away from me for such along time and also he doesnt really know his dad's family that well.
AIBU?