Baby Dad issue

Y'all 🙄, So Me and My Baby Dad has Been together for almost 2 Years on and off and Our Sons First Birthday is This Friday, But his Co parenting skills Are Horrible, He Loves to Pick Fights and Arguments over little stuff. Like the Other Day My Son is Getting a Smash Cake and I Already put in that Order and Later that Day I told him Let's her 2 Cakes Mind Y'all the cakes would be free. If all the Baby gone do is smash it how would everyone Else there get a slice...... He Picks a fight with that "why get 2" Blah Blah Blah🙄 How Do Y'all Deal With Baby Dads Like That Wanna Argue about little shit????