Busted:

"Colonel."

Sam's tone wasn't insubordinate. It just emphasized that anything less than the truth was not an option anymore.

Crazy that the life and death situation had come down to this, exposing something that he'd worked so long and hard to hide. In spite of his best efforts Jack recognized that he was so busted.

Realizing that his hiding place was no longer safe, Jack spoke up, being as honest with himself as he was the interrogator. Finally ending his confession with…

…."Because I care about her.

A lot more than I'm supposed to."