Wow Spernkey have you got a chip....
I was dumped on from a great height by someone I considered a friend, it was mutually beneficial at the time until it did not fit in with my work provider.
I then got dumped out of work without a second thought, so in my case it was justifiable revenge.
I will never feel sorry for the **** and as for never getting on, I now have a VERY VERY good job, so in fact he did me a favour