When Peeta said that she loved Katniss in the interview was that true or just a show for the audience just to keep them both alive

I say it was both but I really do think he started to believe it more throughout the book

It is true that Peeta ment this because he said he had a crush on her since the first time he saw her.

It was true, the fact that it helped keep them alive was just a bonus.

True. Peeta Mellark had a crush on Katniss since he was 5 years old. It was kindergarten. He loved her as soon as he laid eyes on her.

That was true,becausec he like her when they where little.