Jack’s face… you see his heart break several times during their time together. Especially after the Doctor admitted to running away from him. I actually disliked the Doctor in these episodes, he was so horrible to Jack.
Although, in a way – I’m kind of glad he was. Because of this, he went back to Ianto. Thank God he went back to Ianto, he finally received the love he deserves.
Agreed, he was a total ass to Jack, it wasn’t Jack’s fault that Rose changed him… if it was anyone’s fault it was the Doctor’s…