Oh Matt has a temper and he loses it often, but he doesn't see a point in taking his anger out on Katniss. If he's going to give into his temper, it's going to be on inanimate objects like a punching bag or his apartment or someone who deserves it. The fact that there's no one person to take this out on means he's more likely to head to the gym later.

No, he's not a better person. He's just had a lot of years to learn to control himself. He's very angry about the situation, but not at her.

"Of course I'm not," he tells her. "But you didn't do this to me so there's no point in being angry you."