I've used the 'not ready for a relationship' and had it used on me. When I said it I meant it..when they say it they did normally start dating somebody else shortly after.

Well my wife (soon to be ex-wife) of 16 years told me ' I need to go & find myself'. I tried to tell her that I knew who & where she was, needless to say not one of my sensitive moments, it didn't go down to well!
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Better a diamond with a flaw than a pebble without one.

I had this one a few months ago, think it's a new one:

"I do fancy you, I do like you, we get on well and I would go out with you. . . but not at the moment!"

Utter bull, sooooo funny!