Would you also be mad at your friend if?

okay so i had a party and so did another girl on the same day & my friend who dislikes her went to her party instead of mine & hes actually my friend unlike her. He also said he was gonna try to make it to mine also but by the time he could be picked up my party was ending. He said that its not like he wa trying to not make it to mine but im just mad at him for going to someones party who he dislikes instead of his friends. Would you be mad too? Thanks (: