Like a hot bun...

This is an interesting one, and something I find hard to admit: I've never been ditched.
I've managed to avoid that moment of utter arse-ness that occurs when someone says they dont want to see you again, until now.
I've dumped people left right and centre, I'm a serial dumper. What a complete bastard I am, but I do warn them in advance. Turn the tables on me though, and I'm carving people's names in my forhead with a compass. Failing to notice the whole time that it makes me less endearing than I think.
The funny thing is; being dumped is a bit like being knocked out (something I've also experienced, thankfully not in the same outing). You watch boxers get clocked right in the kisser and they stand with fists still raised for a second before keeling over. You feel the initial 'hit' and then deny to yourself that its really happening, as you slide onto the metaphorical canvas that turns out to be your half finished pint.
Bottom line: if you like someone, and you really dont want to let go of them, a sharp gut-punch of rejection is a decent smelling-salt for realising how much of a mug you were being to start with.
And, as for you, your loss.