Annoyed with my fiancé

So today is my son’s 1st birthday and I still have a lot of things to do last minute for his birthday party tomorrow.

My fiancé said we were gonna take our son out for a little birthday dinner after we do all the things I need to for his party.

But instead my fiancé is out drinking with his coworker cause they won some work competition and I’m frustrated cause he already knew since THIS MORNING what all I needed to do and get done for tomorrow.

It’s just so annoying that he’d rather be out and drinking with his coworkers than being at home and spending time with his son on his birthday.