[She relaxes against him, putting a supportive arm around him to as she listens. It's not so bad. Comforting even. She probably wouldn't have if she couldn't also see it as comforting him, but it works and she doesn't have to think too hard about any of it, because there is listening to be done.
She is learning a lot about him that she suddenly feels odd for not having known before. Maybe not all the intimate details but she really didn't have the greatest sense of what kind of world they were from even with hints from conversations from previous Doctor's and Jack.
But more than that she feels for Ianto and his loss. Maybe a little surprised that he was putting out to save him and his girlfriend form suspicion, but she wasn't there and as long as it is, she's sure he's leaving out plenty of connecting details. Besides, when you love someone, you're willing to do things... She was ready to kill Clay recently because he threatened Reid's life.]
I'm sorry about Lisa. [She means that even if it has been a long time.]
There's just one problem with the moral of the story. I'm not the one who gave up hope. I'm the one who kept fighting for us while he kept pushing me away. I'm the one who wanted to work through it together and be there for him. And I'm not the one who killed her. I'm the one who as soon as he was back he would have remembered just as much her. How long do I keep fighting when he's telling me to stop? When he's showing me he loves the memory of a girl he never got to be with more than he loves me? [Voice definitely cracking here, she stands up and takes a deep breath, pacing through the coffee table as if it wasn't there.]