Here Today, Gone Tomorrow.... lather, rinse, repeat?

I don't understand why a friend stops talking to another friend. 

No, this has nothing to do with "Priest-Boy", but rather, something to do with a friend who was with me when I was going through some of the David-Drama.  He said he couldn't understand it, and promised he would never not talk to me for any length of time.

... it's been since May now, and the only communication I've received from this person was one text, and that was after I had been calling hospitals and checking accident reports and obituaries to make sure they weren't in a coma or dead.  Did they call when they said they would?  Nope.  Nothing. 

Sometimes I wonder why I bother to keep trusting people all the way?  Lord knows I've been burned by enough friends over the last 30-some years, it's a wonder why I bother having any....

*sigh*

I'm just venting.  I know there are plenty of people out there who ♥ me, and I should be happy with that.... screw the ones who've hurt me, right?!

Right.  Now, how do I make my heart not hurt after being let down, abandoned & forgotten by someone who I trusted?