"Two heroes with different perspectives on the war - perspectives based on our love of two human beings. That's why she wanted me to work with you, so that you'd tell me Gaius was still alive. She wanted me to lose my mind."Six said those words in front of the guy, when the three Cyclons were trapped with him under the rubble of that building.
I suppose Gaius might be a common first name, but... who else could Sharon be telling her about? I guess it's not a trivial connection to make.