I cried. I really cried. Not when Ianto actually died, but when Gwen kneeled beside his body and just lost it. What a sad episode. But it made me wonder, what would you do? No hope of defeating the enemy. You decide to give a way the most valuable asset you have: your children, your future. Unimaginable.
Imho, nothing describes it better than this promo (it's also a scene from the fifth day): Gwen talks about The Doctor (http://www.youtube.com/watch?v=zCZmjbWYGME)