reason being... i've got an ex from 2+ years ago who still texts me... every holiday like clockwork I get a "happy whatever" message. most recently (today) I got an invitation to go to NYC for a Yankee game (he even noted in the message "sorry if you arent interested I sent this to my whole phonebook")... after 2 years its time to delete my number!! And WTF why are you inviting your whole phonebook on vacation? I often think about writing something to that extent back but don't care to open up the door of communication.
I don't have his stored- just recognize it when it comes up... one of few people I know in that area code, even.