By Andrew Gould Shannon Sharpe had an unconventional assessment of the Dallas Cowboys. Making a rare Thursday appearance on ESPN’s First Take, the former tight end explained why he’s lost faith in America’s Team. “The Cowboys are like my exes,” Sharpe said, via NFL Network’s Jane Slater. “Look good but don’t trust them.” Let’s put aside any evaluations of Sharpe’s former girlfriends and focus on the Cowboys’ credentials. Dallas looked like a juggernaut when dominating the Philadelphia Eagles in Week 14. The Cowboys earned a 19-point average margin of victory during a six-game winning streak en…