At the inquest into their death the distraught woman told them she was sorry for not being "more vigilant".
After the coroner's court heard days of details from the day the 52-year-old killed four pedestrians and a heroic cop, his wife Rohey Hydara said today: "I can't believe I was married to someone that evil."
Masood was shot dead by police on March 22 last year after stabbing PC Keith Palmer, 48, to death and ploughing into Kurt Cochran, 54, Leslie Rhodes, 75, Aysha Frade, 44, and Andreea Cristea, 31, on Westminster Bridge in a rented 4×4.
His widow was refused anonymity by a coroner at the inquest, but was allowed to give evidence at the Old Bailey.
Ms Hydara insisted she had no idea what Masood was planning, describing it as an act of "evil".
She said: "I would like to speak to the victims and families. I'm sorry that I was not more vigilant. He made me trust him and I had no reason to doubt him.
"I know it's hard. It is for me every day. I cannot imagine what you guys are going through.
"I hope my being here today will give you answers you seek.
"I cannot believe I was married to someone that evil. I hope that you find closure at the end of all this and you move on and do not let him win."
The night before the attack, the couple spoke on FaceTime and she said Masood appeared "emotional" with a red face.
He told her it was a rash but she thought it was because he was upset about his stepfather being ill.
On the morning of March 22, Masood sent his wife and children a text saying: "I hope you guys are all okay I have been thinking about you lots, love daddy."
At about 2.30pm, just before the attack, she got another text containing a "Jihadi" document with a picture of Masood on it.
She said she thought it was "strange" and texted him back asking to speak urgently.
On seeing pictures of her husband lying injured after the attack, she phoned police saying: "I think my husband is involved in what's happened at Westminster."
Ms Hydara, who married Masood shortly after meeting him in 2006, said her husband was more religious than her, more strict in eating halal food and had tried to make her wear Islamic clothes.
The Old Bailey heard Masood started taking steroids when he and his wife and their two children moved to Luton in 2009, and took his gym training seriously.
Ms Hydara said he was "very, very short tempered" and threatened her with divorce twice – once when she refused to stop wearing trousers and again when she asked him not to take steroids.
The inquest heard Ms Hydara recorded Masood's rants when he was in the throes of steroids.
In one bizarre monologue played in court, Masood's raised voice is heard to say: "I never hear you say there's any good in Isis, I never hear you say at least they're fighting against the Shia, they're doing some good.
"All you say is they're bad, they're evil and they're wicked, there's no good in them.
"You even said they're the same as the Jews and the Shia, which is absolutely disgraceful.
The rant ended: "They're not the enemy."
Gareth Patterson QC, for four of the victims' families, said: "It sounds as though you agree what your husband did was barbaric and inhuman?
"You received his Jihadi document just minutes before he set off in that 4×4 across the bridge. Would you agree that the contents of that document, attempting as he was to justify his actions, were absolute nonsense?"
Rohey Hydara, who was married to the Westminster attacker for 10 years, agreed.
She denied playing down her knowledge of Masood's extremism.
This week we reported how Masood's mum was worried he would kill someone in a fit of rage.
The inquest into last year's attack at the Houses of Parliament heard how Khalid Masood's own family were concerned for him – and that he was linked to a string of other violent incidents.
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