Jack was angry. And when Jack got angry, it became very hard for anyone to rationalize with him. And it was true, he didn't want to hurt Ianto, not really, he didn't want to make things worse. But... "I can't just stand back and let you do this to yourself," he said, staring down at Ianto, looking every bit as hurt and betrayed by the fact that he hadn't been trusted with this information before then as he felt. "Every time, Ianto, you do this every single time! What do I have to do, what do either of us have to do in order for you to trust us? Because hell, I'll do it. I'll do it right now if you want me to. Why is it so difficult for you to get that?"

Ianto shut his eyes, taking in a shaky breath. "I... I don't know, Jack. I do trust you, though. I trust both of you. More than anyone. But, I..." He shook his head. "I... I don't know."

A muscle in Jack's jaw clenched, and his breathing picked up. He wanted to yell, he wanted to scream and rage at the other man, and ask him what the hell he thought he was doing, toying with him like that. But the fact of the matter was that he agreed with Sulu, at least to some extent. He didn't know what would happen if he made Ianto upset enough. So...he did the only thing he could think of.

"Fine," he said, tightly, angrily. "Fine. If... If that's how it's going to be, then fine." He took a step back from the table. "I can't do this. You can't keep doing this. Call me when you've figured it out. Then we'll talk." He turned on his heel and headed out towards the hallway.

"Jack!" Ianto called out, sounding every bit as upset with how things were going as he was.