[By this point Ianto has been here long enough to start feeling a bit truthful, so when he pulls out his piece of paper he has to pause a moment to think about it.]
What was the biggest problem/complication in your previous or current relationship? [Previous relationship is obvious, she was a robot, so current one then.]
Can't really think of any. [It almost sounds like a question, and he actually glances at Jack on the other side of the circle of chairs for something like confirmation. No problems, right?]