You shouldn't skip out on your friend's birthday.
John has had a friend since childhood and their birthday is today.
John wants to have a good time.
John plans an elaborate birthday evening for his friend.
John receives a call from a new lady friend who wants him to come out to the bar which he does.
John's friend appreciates the efforts and has a very memorable birthday.
John's friend since childhood feels betrayed that John chose somebody else over them on their birthday.