What ever happened to humility? Once valued in our culture, humility just isn’t practiced at all. Instead, we have a self-centered, chest-thumping, braggadocios, pat yourself on the back generation with an exaggerated self-importance.
That's how it is, if you are there for people, they imagine you will always be waiting for them, when you have had enough of the one sided friendship and you stop making yourself available, all of a sudden they notice, by then you don't give a crap, you just wish you hadn't wasted time with a self centered ingrate.
To intentionally disregard those who have continually had your back, silently acquiesced to your manipulations, and always loved you despite your irresponsible, careless, and often rude actions proves immaturity and narcissism. But oh wait, a narcissist would have to recognize, admit, and accept one's narcissism first. That's work-- and thus far, per the track record, it's easier to be in denial.