User friendly? Needs you...but often times may use you
It means there about to sing, "It's a bear necessity! A basic bear necessity!"
Ok just ACT like that was funny. Anyway, means that they really like you as a friend or something closer then that :)
I'd take it as a compliment, however might be better to have said, "if I lost you as a friend, I would really want you back, you bring me value and I really appreicate that".
They were trying to make you feel important.
Steer clear of that one- sounds like an obsessive control freak to me!!
I will think that to that friend I'm a commodity. A THING that that friend couldn't live without.