Temperamental "Apprentice" contestant Chris Shelton (search) says he's not angry, just "passionate."

Shelton broke his silence last night after becoming the 13th contestant to be fired on the current edition of the NBC series.

Shelton, 22, a real estate developer from Lake Las Vegas, Nev., explained why he cried after Donald Trump (search) declared, "You're fired!"

The dismissal came at the end of Shelton's seventh consecutive appearance in the show's boardroom, where he had narrowly escaped being fired several times before.

"It was definitely an emotional release," Shelton said. "I would say that I was obivously disappointed in myself and the fact that I didn't achieve the highest level of success on my task.

"The entire process is very tough. Throughout the tasks, you're constantly moving because you have to finish the tasks. And in order to do that, you're not getting a significant amount of sleep that your body needs to function, which is a huge part of it," he said.

"Also, you become very close with the other contestants from the show," he continued. "A lot of friendships are made and it's difficult to be working with someone and then they're gone the next day, or you end up with them in the boardroom and you're having to battle against each other and one of you is going home."

Shelton also gave his side of the confrontation in a Tampa casino that led to his headline-making arrest last weekend on disorderly conduct charges.

"I would have to say I was out of line for raising my voice," he conceded. "For the record . . . I had a confrontation with one of the gentlemen at the front desk and then, after I asked him to bring out the manager and the manager came out, we had a confrontation and a difference of opinion as far as the fact that I had to pay a cover charge [of $20 for a casino bar] when I was paying $2,000 to stay there for two nights and had rented out the most expensive suite in the entire hotel."

On "The Apprentice," (search) Shelton earned a reputation for having a hair-trigger temper. Last night, he explained what's behind all that emotion.

"I am a very passionate, energetic person that thrives on life," he said. "That emotion and that passion in me sometimes comes out in a negative light."