I won't go into too much back story as what I'm asking today will got lost in the midst of everything else.
Basically when it's our DS's birthday we always his party on the Saturday closest to his birthday (party is family and a few friends over our house- I do all planning, cooking, cake etc). His birthday is end of April, today I said to my partner we will have to invite some school friends and he turns around and says that we can't have his party on the Saturday as he's going out drinking. I said I couldn't believe he'd booked to go out drinking on the day we'd be having DS's party. He said HE never does parties at the weekend, always on the day of birthday. Which is a complete lie. His night out isn't just Saturday night out then home or it wouldn't be be issue. He wants to go to his dad's house and stay there Saturday and most of Sunday as hell be hungover/he can't manage to get up or out of the house before 2pm.
He told me I'm a bitch and I'm trying to ruin his night out. I said that he's planning on going on a weekend piss up knowing we'd have had our son's birthday party (it's 2 days before his birthday which is on a school day). He know when our son's birthday is, he didn't even clarify dates or ask what we were upto. He's the most selfish person I know and it's always about him. He literally made plans not giving a shit about anyone else.
He's now saying we can have his party the following weekend. Which in some ways I understand and maybe I'm unreasonable but I don't see why I should not have his party on the weekend closest to his birthday so he can go out drinking for a weekend (and assuming I'm looking after our child the weekend without even mentioning it). I've said that as a compromise we can have his party the Sunday but he'll need to come home to our house after his night out because Sunday morning I need to do all the party food, sort cake etc. Apparently no, it's not good enough. He's told me I'm a bitch and selfish and he won't be coming back that weekend at all.
Oh and this is what he does. 2 weeks ago he went off to stay in the same family members house to watch rugby. He could just come home (it's 40 mins from where he's going out) but he told me he was going fri-Sun evening. I asked if he was planning to see our child at all that weekend and he said if I wanted him to have DS I'd have to drive him there but only after Saturday as he has plans! He doesnt even discuss, ask etc. I was unwell the weekend and he buggers off for 3 days to stay elsewhere whilst I'm looking after his child.