1 time. He gave her bread when she was starving
Bread.
yes
Tresh saved katniss life in chapter21
He never died. -_-
It's life
He gives Hera slap and a good thrashings
Josh Hutcherson is the actor of Peeta is real life. As of 2012, he is alive and well.
If you die and i live, there's no life for me at all back in District 12... You're my whole life.
So that she and Peeta can get sponsors who may end up saving her life in the games.
"Peeta Mellark! Oh no, I think. Not him. Because I recognize this name, although I have never spoken directly to it's owner. Peeta Mellark. No, the odds are not in my favor today." Page 25 (direct quote from book) Katniss is shocked because she recognizes the name, and feels scared because Peeta saved her life before (by giving her the bread) and she is thinking how she will have to fight him in the Hunger Games.
(Spoiler Alert) If you are talking about while they were in the cave, it was because she wanted to go to the dinner to get the medicine Peeta needed. Peeta wasn't going to let her go and risk her life for him, so he needed to fall asleep.
The only reason why he joined them was to prevent them from hurting Katniss, even if it would cost him his life, which it very nearly did