Popular television host, Ryan Seacrest has split from his on-off girlfriend, Shayna Taylor for the third time, and it looks like the split is permanent.   A spokesperson for the American TV and radio host confirmed their split in a statement, saying: ‘Ryan and Shayna decided to end their romantic relationship amicably some time ago. They remain good friends, each other’s biggest supporters and will always cherish their time together as a couple.’  The 45-year-old has already moved on from …