[Jack doesn't blame him for the accusations. He did keep secrets, for right or for wrong, and it's got to be hell to find out like this. He's just glad Ianto's come back to him now, that he can hold him tight as if that'll stop him ever being torn away from him.
Gently, he gets his back against the wall and slowly starts to slide them down it. His legs are feeling trembly enough; heaven knows what Ianto's feel like!
And all the time, he's gabbling away with soft nonsense words as the tears roll down his cheeks.] Shhh, it's all right now, everything's all right, I'm here, I'm here and you're not going anywhere, not while I have any say in things, because I love you, Ianto Jones, I love you and I am not losing you again.