I'm sorry. I didn't realize. [Because really what do you say to that? He's been right there and at the time he hated hearing people tell him it was going to get better.]
I started sleeping with Jack while my girlfriend was dying. [So much more complicated than that but he doesn't want to bore her with explanations of Cybermen and how desperate he had been to keep her alive.] It took a long time after she died just to be able to get out of bed in the morning without hurting, and even longer to sort out how I felt about him. Give it time. I'm afraid that's rather cliche, isn't it?