The fact that Ianto kept things from Jack didn't surprise Sulu, not really. And after this, how could he ever expect Ianto to not be holding things from him as well? He wanted to tell Jack that all he wanted to do was scream and yell at Ianto but his heart twisted in his chest even thinking about it. He wanted to take Jack's side so much more than he already had, he wanted to make Ianto tell him everything he'd ever lied to them about, but he couldn't.

"There's no way to know," Sulu said, hurt tinging his voice. "I don't know, Jack, but. I know that he didn't do this out of spite. He couldn't have. Ianto doesn't do things like this out of spite or malice. You." He swallowed, moving to lean against the wall nearest them, rubbing his face with his hands before tilting his head up to look at Jack, taking a deep breath. "You're not supposed to do anything. There's no right answer here. But. If. If this is - if this is it," and now he knew he wasn't in control of what he was saying, so he closed his eyes and turned his head away, keeping his voice low, "If this is all we have left, do you really want to walk out on it now?"