Ex has been an ex for over 4 years now and not even seen him in 4 years as he lives in another city. He contacted me over facebook about 6 months ago and sends the odd message every now and again - usually about how down and depressed he is, how he desperately wants a girlfriend but will never, ever get on because he's such a loser and he's so down about everything blah blah - I was VERY sympathetic at first but this person has ALWAYS been selfish in that he loves to drone on and on about his own problems but if anyone else has problems he doesn't want to know.
Example: him - "hi, how are you?" me - "a bit stressed, how are you?" him - "YOU'RE stressed?? ha what do YOU have to be stressed about!? you have it made!" he's single, good job, lives with parents still so hardly any bills, no ties, free as a bird - I'm a single parent, uni full time, rented house to pay for etc etc but yeah - I've got it made 
But as I say, usually I'm sympathetic and listen like a knobhead while he drones on and on. Tonight however I just couldn't be arsed. We ALL have problems for fucks sake.
So he sends me a message saying: "How are you?" I sent one back saying "good ta, hows you?" (lie, I actually have tonsilities and feel shocking but didn't want to get into the "who's worse off competition" again. So he replies "oh really, really bad. Absolutely shit. I hate my job, I have no friends, I'm never going to meet anyone, if I wasn't here nobody would even notice."
I was just about to reply with the usual "there there dear" response and he added "oh forget it, I'm going to bed". At this point I'd normally start up my councelling pitch but tonight I simply said "ok, night".
Feel a tad concious that if he IS that down and did something to himself it would kinda be my fault? but I'm sick of his fucking whining, I really am.