Buffalo Bills quarterback Kyle Orton’s decision to leave the Dallas Cowboys during the summer stemmed from his bad relationship with starter Tony Romo, according to NFL.com.

“The relationship, I’m told, between Kyle Orton and Tony Romo was untenable,” NFL.com’s Ian Rappaport said Sunday. “They believed it could not continue, which is one reason that Kyle Orton essentially forced his way out of Dallas and signed with Buffalo as a free agent — a move that coach Doug Marrone initially resisted because they’re paying (Orton) $6 million.”

Marrone reportedly grew concerned that Orton’s large salary may hurt the confidence of second-year Bills quarterback EJ Manuel. That view changed after Manuel, a former first-round draft pick, struggled last week against the Houston Texans. Instead, Marrone decided to replace Manuel with Orton as winning became a bigger concern.

“I am told Doug Marrone made the decision to replace EJ Manuel with Orton in the locker room after the game, solidified it on the flight back,” Rapoport said. “That’s how fast it was. Checked with some of the team’s veterans, got no pushback. Mainly because the talented skill position guys ‘welcome’ a new quarterback.”

Orton brings more stability and experience to the position, which could better serve the rest of the Bills offense.