Wow, Ruby ...
I hope my post didn't offend you. It wasn't aimed at you ... it was an explanation as to why sometimes people can walk out on a friend (but from my perspective).
I see you as the victim here. When someone walks out on you without an explanation, they're the abusers. What's even worse is when you make time for friends, but they never make time for you. Or when suddenly they vanish into thin air when you need them. It sucks. It really does.
As to why other people are treated better than you ... It's because you need to be a little more demanding as a friend. Don't let other people walk all over you. No one is better than you. We are all equals. If you want to be treated like everyone else, command attention. Show everyone your true worth.
You can do it. I believe in you.