By Tzvi Machlin At 29 years old and coming off back-to-back Pro Bowl seasons with the Kansas City Chiefs, Tyrann Mathieu probably should have a contract by now. Instead, he’s lamenting how things went at the end of his tenure is KC. Speaking to Sam McDowell of the Kansas City Star, Mathieu had one word to describe how he was feeling when he learned the Chiefs didn’t offer him a deal like Justin Reid. “Heartbroken” was the word he used to describe how he felt. “Bro, I was depressed,” Mathieu said. “Heartbroken. Heart. Broken. “I could not understand it. I could not, man.” Mathieu complained tha…