Sorry this won't help wour problem but this drives me crazy.
"I could care less", does not make sense in the context you are using.
You mean " I couldn't care less".
I could care less is the more sarcastic equivalent of I coudn't care less. Both mean he doesn't really care.
This is fairly common in the US and it does make sense. "I could care less(but it doesn't really matter since I care so little)
