Hun, THAT we can often pick up on ;) It's the words that get tangled. An "I don't know" response to a serious question gets pondered more than E=MC2.
Did he mean that HE doesn't know, but someone out there probably does?
Or did he mean he DOESN'T know the answer, because it's locked away in some part of his wounded psyche?
Or did he mean he doesn't KNOW, as in the knowledge is buried in the turmoil of his emotions?
And that a slight warble at the end of the sentence? Why, he's fighting to control his emotions, because he's been hurt before.
So he must be in love too! (ack!)
The warble comes from resisting the urge to strangle her. ;)