Jack leaned forward and wrapped his arms around her waist, swiveling his chair sideways and pulling Martha onto his lap. He sighed and frowned, knowing that she'd be able to see right through anything he said to contradict that he was fine. "I just... I don't know. Some times it gets to me... this job and the way that I am. For the rest of my life... hell... for eternity, I'm going to lose everyone that I lvoe and care about. I try not to get too attached. But sometimes, there's a special few of you that I just can't help it. The team that I built was like that. Then I lost Suzie, Owen, and Tosh. Somehow, Tosh came back and I'm grateful for that. But you, Gwen, and Ianto... you three are special. Gwen's become my best friend and I'm closer to her than words can ever describe. Ianto wasn't supposed to happen... he was some fun on the side because I knew I could never have Gwen. But over time, it changed and I realized I actually love him. But you..."
Jack smiled faintly and cupped a hand to her cheek. "You're so much more. I'm as close to you as I am to Gwen. I love you just as much as Ianto... more even. And we've both seen and done things the others will never understand. End of the World Survivors Club.... the Year-That-Never-Was... travelling with the Doctor..."
He sighed and finally whispered what had been bothering him since Ianto disappeared. "I can't lose you too, Martha."