Ms Dooley taught on a business diploma course

Business lecturer Jennifer Dooley, 26, broke the news to her students at Manchester College of Art and Technology in a farewell letter.

It is understood she resigned in a dispute over taking time off to watch Hatton take on Floyd Mayweather.

College principal Peter Taverner said her desire to support her boyfriend at Sunday's fight was "understandable."

In the letter, which was read out to students on Monday, Ms Dooley wrote: "I'm really sorry that I am not there to see you today.

Hatton is fighting at the MGM Grand in Las Vegas

"You have been a pleasure to teach since September and I have really enjoyed the lessons with you and being your teacher.

"I will send you all an autograph into college when I get back from Las Vegas."

The pair, who attended Rosehill Primary School in Hyde, Greater Manchester, became an item in 2005.

The college, one of the biggest in the country, has students based at 14 campuses across the city.

Mr Taverner said he was now backing Hatton to triumph over Mayweather.

He said: "Jennifer is a great member of staff and an excellent teacher, we understand that she wants to support Ricky.

"We wish them every success and hope Ricky brings the title back."