Yeah, I would guess that. for a man it's usually "I'm not ready for commitment"
Probably yeah.
Both literally mean "look, you were alright for a shag, but I wouldn't want to have to pass up a better opportunity because I was with you now would I!"… Again, cynical, moi?
The one and only time I ever dumped a girl though, I actually used the truth! Which made her feel awful for about 3 months it would seem… Oops! Still, we're good mates now, and besides, she now bats for us so I feel less guilty for having dumped her in the first place…
Still, I believe in karma and all that. Better to be open and honest withe people, one day it will be rewarded.