Pitino said Thursday that he kept quiet to "contain" potentially damaging information.
He and the attorney for Karen Cunagin Sypher, who is charged with extortion, had multiple heated exchanges during two hours of questioning Thursday.
Pitino a day earlier acknowledged on the stand the two had sex in a restaurant booth. Sypher has alleged it was rape.
During questioning about the rape allegation, Pitino interrupted defense lawyer James Earhart saying he's "here to give the truth." Earhart replied: "I bet you are."