Any advice apreciated?

On the 11th of May its my boys birthday party his birthdays on the 10th. Ive booked for him to have 10 friends at a play centre near where we live.. He will love it!! :)

However, what do i do about his dad???? I dont want him there at all, imagine he wud ruin the whole day just by his presence in the room. But am i being selfish thinking like this?? He has asked me what am i doing for our boys birthday and i said 'oh im not sure yet'

Hes only going to be 2 this birthday, and he wont remember this party when he is older will he, if he wants his dad there wen he gets bigger then thats something il have to get my head around. But im feeling bad and dont no what to do? do i say yeah im having a party and no i dont want u there or do i keep quiet and hope he doesnt find out?

Any advice would be greatly apreciated. Thank you xx