Lt. Gov. Bob Duffy is “profoundly grateful” to Gov. Andrew Cuomo for giving him the opportunity to serve as his number two over the last 3-1/2 years, he wrote in a letter informing the governor he won’t seek another term.

The letter, which first was reported by the Democrat and Chronicle of Rochester, was formally made public by the governor’s office on Thursday morning.

Duffy wrote in the letter that the decision to not run again was not a political one, but made for personal reasons, mainly the amount of physical pain induced by the constant travel he has undertaken as lieutenant governor.

Cuomo had apparently offered to reduce the travel load, Duffy wrote he wouldn’t want to continue on in a “reduced” capacity as lieutenant governor.

“I could not be prouder to finish my public service career alongside you,” Duffy wrote. “I will always treasure my four years as your lieutenant governor.”

Duffy added a lengthy list of accomplishments during his time in office, including the economic development councils, which he chaired, and the effort to keep the Buffalo Bills in western New York.

Duffy also added a defense of concerns the state has ignored his hometown of Rochester, writing that wrote that “contrary to some perceptions” more economic development has come to the area in decades.

And Duffy insists his decision to join the ticket in 2010 was not because he aspired to statewide office, but because Cuomo asked him.

“While I never sought this position, when you asked me to join your team you made a number of promises and you remain a man of your word,” Duffy wrote.

The former Rochester mayor and police chief is rumored to be the next head of the Rochester Business Alliance, a pro-business lobby group whose current leader, Sandy Parker, is expected to retire at the end of the year.

It remains unclear for now who Cuomo will select as his running mate, but options range from Suffolk County Executive Steve Bellone, to former Rep. Kathy Hochul.

Cuomo in a statement praised Duffy’s time in office and highlighted their friendship.

“Bob has not just been a great partner in governing our state – he has also been a true friend. I have said repeatedly that asking Bob to be New York’s Lieutenant Governor was the first and best decision I made since running for Governor, and that statement remains true today. I am deeply grateful for his service and friendship and I look forward to working together in the years ahead. I wish him and his family all the best.”

LG_Letter by Nick Reisman