It sucks to reach out to someone, then have them dismiss you. You apologize to a long lost girlfriend, and you get two texts before its back to nothing.
You talk to someone going through a rough time, and you make the effort to hang out with them, but you are ignored.
I am indeed guilty of this but it sucks to have someone seemingly fall off the face of the earth. For me its usually the strain or work and school. Or its just one of those things where people grow apart. I end up feeling guilty and after a while I'll try to reach out to people I had lost contact with. I guess if it isn't meant to be, it won't.
Rejection sucks. Hard. It sucks feeling like you came in 2nd place. But don't chase, and wait for that someone who'll put you first among other suitors. That is what you deserve.