"I... if it's okay with you, I'd really like to keep them? And... I think if she'd seen it before now, I'd, uh... I'd have heard about it."

He's completely lost as to how to discuss this with her. There is no other woman, and he doesn't want to tell her any really elaborate lie. He wants to be totally honest with her.

Oh God, Kitten, this is so complicated. I didn't mean to invade so many parts of your life the way I did... did I?