The former tánaiste though also criticised the media for interfering in politicians’ private lives and said coverage of his own family would be something he would not forgive.
Mr Gilmore described his new work as the EU’s special peace envoy involved in the peace process in Colombia.
The former Dun Laoghaire TD said he was “working flat out” on the agreement and had travelled to Cuba, Colombia and Brussels as part of his work.
The work was a “world away” from what he had done previously in Leinster House, he said.
Mr Gilmore, who stepped aside as leader after Labour’s disastrous 2014 election, remains an “active member” within the party.
Speaking to RTÉ, he said he supported the current leader and former cabinet colleague, Brendan Howlin, and still felt strongly on issues. These included calls to abolish the Eighth Amendment of the Constitution which protects the life of the unborn.
Mr Gilmore said he expected to be involved in any upcoming campaign on changing the amendment.
He was also critical of the media and said there had been a “very negative turn” and that political figures or their families, including his own, were “fair game”. “It is something I don’t forgive.”
The former TD said he was considering writing a second book but, unlike his memoirs, it would not be about his time in Government.
Labour activist and communications guru Pat Montague said the party had made a number of mistakes in the last general election where it was reduced to just seven TDs.
But the root of the collapse of support for Labour dated back to the 2011 to 2014 period in Government, he claimed, when it should have fought harder against the rushed introduction of water charges and the orders of the bailout troika.