Jo Cox, 41, was murdered by white supremacist Thomas Mair during the Brexit referendum campaign in June 2016.
Responding to allegations reported by the Mail on Sunday, Mr Cox admitted that some of his conduct towards women during his time with Save the Children would have made them feel "uncomfortable".
Her death shocked the nation, and was the first time a British lawmaker had been killed in office since Conservative MP Ian Gow was assassinated by the IRA in a 1990 auto bombing.
'In the aftermath of Jo's murder, I promised that I would dedicate my life to two things, firstly loving and protecting our children and secondly fighting the hatred that killed Jo.
The allegations against Mr Cox surfaced last week in Britain's Mail on Sunday.
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Mr Cox was forced to quit his role as chief strategist for the charity after it was claimed that he drunkenly harassed a female employee at a drinks party in London, pushing her against a wall outside a bar, holding her by the throat and trying to force himself on her.
Cox, who lived in a house boat on the River Thames with the couple's two sons, said some of the allegations against him were a massive exaggeration.
Brendan Cox is the husband of slain British lawmaker Jo Cox.
He left his role at the charity shortly afterwards.
On Sunday, the paper published what it said was a tearful interview with Mr Cox in which he expressed remorse about his behaviour.
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Also, according to friends of the couple, another reason for the breakup was their work schedule, which is not the same. They said: "In an effort to reduce any further speculation, we have made a decision to announce our separation".
"I have a fantastic team of people who have supported me so far and I know they will continue to do so as we focus on creating a positive legacy for Jo".
"His family are friends with my family, but the fact of the matter is, is that it's not enough just to say "oh I'm sorry", you have to show how you're going to change the way you are in the future and I think Brendan, more so than many I've seen in this area is actually trying to do that".
Details of his alleged behaviour at Save the Children comes as charities face intense scrutiny about their handling of sexual exploitation claims.
Charities in the United Kingdom have been under increased scrutiny in recent weeks following allegations reported by the Times of London that senior staff from British aid organisation Oxfam used prostitutes and downloaded pornography while working in Haiti after the 2010 quake.
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Mufti Saeed who was also nikah khawan of that marriage had not commented when asked about the ceremony of November 2015. What was the point of lying about it? "This whole process was secretive; no one even knew that I had proposed Bushra".
"The Jo Cox Foundation was established in September 2016 to channel the energy and determination generated by Jo's life and murder into practical efforts to advance the causes she championed".