Here's what I have learned in my 40 years...

Real "friends" are few and far between. Good acquaintances are more frequent, and casual acquaintances are many.

For me, I don't try to nurture every relationship into what I term "Friendship" any longer. Far too many people simply *cannot* be really close bosom buddy friends, and trying to force that on those relationships is frustrating to everyone involved.

If there *is* a connection, see what it is. If there is not, it is not rude to simply *not* make plans with the person. You are under no obligation to hang out with everyone you've ever met.

If the individual asks why you are not desirous of time, you can tell him/her in very diplomatic and kind terms that, while you respect him or her, you don't really consider the relationship one of very close ties. Sure, this might hurt some people, but only those that feel they are somehow entitled to be befriended by the world...and do you really want a "friend" who is so needy?