Ianto found her with her head against a wall covered in Missing Persons posters, crying so hard she could hardly stand. He pulled her away and held her tightly against him, and she gripped the back of his jacket and pressed her face against his chest while he told her, "I'm sorry. I'm so sorry."
"She blamed me," Gwen sobbed, muffled by his waistcoat, "She said she had hope before I told her." She held on tighter, and he did, too, letting her cling to him, if she had to.
"It isn't your fault. You wanted to help her, you wanted her to know."
"She would have been better not knowing." She sounded so angry, at herself, at Jonah's mother. Probably at Jack. Probably at him.
"You did what you would want someone to do for you." Her sobs were tapering off a little bit. He said quietly, "If it helps, I'm sorry that I showed you where it was. It's my fault that she found out at all. I knew you would want to bring her there, but – I didn't think -" There was no way to explain to Gwen what he had thought; that the mother would react the way that Gwen wanted her to, the way that Gwen would have. Most people weren't as brave as Gwen. Most people weren't Torchwood.
"It's all right," she pulled away a little, her arms still on his, and raised a hand to wipe her eyes. "It isn't your fault. It – it isn't anyone's. It's just how it is." But she still looked so sad, and Ianto couldn't help the sudden flare of hate and love he felt for Jack; hate for shutting Gwen down when what she needed was an explanation, and love for trying to keep her safe from this. That was Jack, completely. He made the wrong decisions for the right reasons.
"Come up. I'll make you tea." He smiled a little bit.
She shook her head, echoing his smile, a little bit shaky, a little bit teary. "I'm going to finish with this. Then I'm going to go home."
Ianto nodded and stepped away. She went back to the wall and raised her hands to bring down more of the posters. As Ianto turned to leave, he saw Jack watching them from the hall. They shared a look, for a moment, Ianto and Jack, something silent, something sad, something neither of them could have put to words.
Then Ianto left.