I actually cried at the end of that episode. Not when Donna arrived (which The Doctor had a hilarious reaction for) but when he was about to tell Rose he loved her, and then he was cut off. I knew that would happen. I loved Rose and all, but I was WAY WAY WAY WAY WAAAAAY more sad for The Doctor than her. I actually started bawling when The Doctor cried.
Also, I was pissed he just replaced Rose so quickly. Even though it's implied that he loves Rose, the fact that he never got a chance to say it annoys me. God, I could go on about this forever.
It would be really funny and depressing if right when Rose though he was going to say "Rose Tyler... I love you", he just said "Rose Tyler... I have always thought of you as my one and only best friend. Just know that."