"Friends" Forever?

Sooo, this issue has been bugging me for a while now...
I'm constantly doing you favors, I've always been there when you needed me, picked you up when you were feeling down, let you borrow money, gave you my time, energy and attention...so why aren't you there when I need you the most?
Sound familiar?
Why is it that you always do what you can to serve others and whenever it's you who needs assistance or someone to lean on, no one's ever around?? I abhor that people have become so lazy, self-absorbed and preoccupied with their own little piteous day-to-day problems that they will often overlook the troubled facial expression or change in demeanor of a fellow compadre. They become oblivious to even the most obvious signs that their friends are facing grave problems. You'd think a real friend could discern right away when something's up with you!
Please do tell me, how greedy and selfish is it for me to simply ask you for the same thing you wanted from me, your help? Is "reciprocation" such a detestable concept or is it just unfamiliar to you? Can I call you a "real" friend at all? That's kind of the disadvantage of Facebook, the fact that you have so many "friends",  when really what percentage of those friendships are based on a genuine, personal relationship and not a superficial one? How many would catch a grenade for you? I thought so.
I was horribly sick last week and some friends knew, yet only 1 even bothered to ask how I was feeling, now maybe it's not that big of a deal, maybe I'm being dramatic but something inside me couldn't help feeling a little hurt and lonely. It's nice to know that someone is thinking of you. I thought to myself, well at least I know now who my real friends are.
So forgive me if I burst your comfortable little "me" bubble to ask for a hand, excuse me that you have to put in a little effort to call me up and see how I'm doing and if everything's okay. I'm sorry for needing a little support. Sue me for needing a true, caring friend during a difficult time in my life.
People will always be there when they know they can use you for their own benefit, be cautious of these people, they just use you up like gasoline and drain you out, returning not to fill you up again but only to drain you out some more, believe me I've had a few "friends" like that. It's called a one-sided, burdensome friendship. What about your friends, will they always be there to catch you when you fall or will they leave you hanging every time?