Songs that say "I'm glad to be rid of you"...

[LSPoorEeyorick]

How about Ben Folds' "Song for the Dumped"? Though it's not appropriate for your situation per se, it does say "I'm glad to be rid of you."

So you wanted
to take a break
Slow it down some and
have some space

Well **** you too
Give me my money back
Give me my money back
you bitch
I want my money back
(And don't forget to give
me back my black T-Shirt)

I wish I hadn't
bought you dinner
Right before you dumped me
on your front porch
Give me my money back
Give me my money back
You bitch
I want my money back
and don't forget...