Hunger Games oneshot

Peeta Mellark.
A boy from District 12.
Winner of the 74th annual Hunger Games with his district partner Katniss Everdeen known as the girl on fire.
Fell in love with Katniss and got engaged to her to try and stop a revolution.
Volountered for Haymitch Abernathy for the 75th Hunger Games, the 3rd Quarter Quell.
Captured by the Capitol during those games after the force field explodes.

What happened to Peeta in his time at the Capitol?