I have three friends I met at University 18 years ago. Saw them recently after two years (I instigated a meet up in August) and as we left they said we shouldn't leave it as long next time. Sent a message to group chat couple of weeks later suggesting we meet October time, one replied, the other two ignored my message. It's one of the ignoring ones birthdays next week. To be honest I wonder why I'm bothering to send a card as usual when the person blatantly ignored my message. I probably see them as a group about once every two years on average but don't want to be rude by not sending a card. Card or no card that is the question!