Larissa Ferrari alleged the married midfielder subjected her to "physical, moral, psychological and sexual violence" - including forcing her to film degrading videos, in an exclusive interview with The Sun on Sunday.
The Brazilian lawyer, 28, also accused the former West Ham and French international Payet, 38, of making her take part in a fake wedding and wearing a ring to "prove her love".
She also alleged he made her drink her own urine and water from the toilet, and lick the floor.
Larissa showed The Sun on Sunday photos of her bruises which she said she'd handed to police.
The mum-of-two said: "He's a sick monster. I was scared for my life, and I'm still scared."
Larissa wearing bridal gear for 'ceremony'
Payet, however, has denied "physical and psychological violence" in a statement to Brazilian cops, reports local outlet G1, which claims to have seen a document detailing the case.
The footballer admitted to having had a seven-month affair with his accuser after "becoming lonely" while playing for Vasco da Gama in Rio de Janeiro.
Larissa told G1 she suffers from Borderline personality disorder and claims Payet took advantage of her condition.
"Dimitri knew about my passion and psychological problems, using this against me," she is reported to have said by the Brazilian outlet.
"Dimitri convinced me to put my head in the trash, in the toilet, made me drink my own urine and other sexual bizarre acts."
However, Payet's statement allegedly sees him claim everything was consensual and proposed by his accuser.
It refers to an incident where Larissa "requested slaps during sexual intercourse" which resulted in marks on her body.
The footballer is also said to have claimed the pair used wooden chairs during sex.
G1 reports Payet alleges he refused Larissa's wish to continue their relationship as he prepares to return to France, which would include him paying her expenses.
Payet has four children with his wife of nearly 20 years, Ludivine, who remained in France after he joined the Campeonato Brasileiro Série A club in 2023.
Payet's lawyer Sheila Lustoza told G1: "It is regrettable that confidential records were leaked, but the case reveals with evidence something that is very clear: a woman exercising her freedom and will, as it should be, contrary to what has been publicly narrated up until now.
"The defence is confident that the truth that is proven by documents will demonstrate these facts."
'I only want justice'
Speaking to The Sun on Sunday previously, Larissa went on to say: "I not only want justice but to also help other women who are blindly allowing their partners to abuse them."
Payet spent 18 months with West Ham before Marseille paid £25million for him in January 2017. He then moved to Rio in 2023 after signing for Vasco de Gama.
Payet spent 18 months with Premier League side West Ham
The footballer struck up a conversation with Larissa over Instagram last August. She claims that Payet used a fake profile. They then started messaging on WhatsApp.
Larissa, who knew the star was married, initially flew 1,500 miles from her home in the state of Parana to meet him in Rio's Windsor Hotel where his team were staying before a match.
She said: "He was very sweet and romantic. It was a very intense date and the following day I went to watch him play. He was so attentive and there was lots of hugging and kissing. I thought he seemed like a lovely man."
As the relationship grew, they started staying together for days at a time.
Larissa said she stopped dating other people and they acted as a "normal couple". But in early December Larissa's pal posted on social media a snap of two match tickets Payet had given them.
Larissa claimed Payet became aggressive and screamed at her. She said: "This was the first time I saw this side of him."
She alleges that sparked off the abuse.
In text messages seen by The Sun, Payet asked for "humiliating" sexual videos of Larissa. WhatsApp messages also show Payet asking for "disgusting acts" to prove her love.
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