Baltar was torn between explaining that he didn't know how to stop doing whatever he was doing (and God, but he didn't want to think about why he was doing it), and lying, only to have her catch him later. He had a feeling the latter would result in consequences he didn't want to imagine right now.

"I'll do what I can," he stammered. It was the best oily compromise he could offer. Hopefully enough so that she would let go of him.