After splitting earlier this month for less than a day, then later announcing their engagement, the 25-year-old model says she is finally through with Edelsten.

But her fiance has denied they have ended their relationship.

Grecko gave the Daily Mail all the details of their latest spat, apparently discovering that the former billionare had not only locked her out, but he had also been talking to other women.

"Geoff has betrayed me again with another woman. He has taken my keys and locked me out and is refusing to get a hotel for me," Grecko told the Mail.

"Not only has he made a fool of me and hurt me but he's treating me terrible, saying I should find my own way home."

However, Edelsten emailed Fairfax Media to refute the split saying simply "We are still living together ... The report is untrue".

The aspiring fashion designer and DJ was in Federation Square early on Tuesday afternoon to release red balloons for the victims of the MH17 crash.

She claims when she arrived home after her media event she could not let herself in and she didn't have keys.

"I’m really hurt that he would do that and he would risk that and that he would be so unfair to me," Grecko said.

"I don’t trust him. It’s really sad because I really have no choice but to leave him because he’s lied to me so many times and just doesn’t care."

Also speaking to the Daily Mail, Edelsten refused to confirm the couple had broken up and denied locking her out.

"She was doing a function and she was supposed to call me and I would then go down and collect her but it didn’t happen," Edelsten, 71, said.

While Tuesday afternoon's events remain unclear, Grecko says Edelsten has "crossed the line" by contacting other women again.

Telling the Daily Mail she's planning on flying back to her Manhattan home, Grecko says to add insult to injury she has been contacted some of the women Edelsten has been talking to.

"It’s been like one person every day," Grecko said.

"The girl Stacey she said, 'He spoils me whenever I want. He still gives me money,' just stuff that really would push my buttons."

The original - if temporary - break-up was also over Edelsten flirting with other women. Grecko took him back on the proviso she could have access to his phone and computer, so she would be able to ''learn to trust him again''.

Grecko said: "He says he wants to be with me and convince me he's serious. He wants us to have couple's therapy and says he'll change."

Edelsten admitted at the time he had sent emails to his ex, Shirley Moore.

Grecko, who has depression, was admitted to hospital following their original break-up but was picked up by Edelsten later the same day.

The next week she announced the couple were engaged and hoping to have a commitment ceremony in Paris in three months before marrying early next year after his divorce from Brynne Edelsten is finalised.

There were indications this week their relationship was on the rocks again.

On the weekend Gredcko tweeted - and then deleted - a homesick message: "Tapping my ruby red slippers to Manhattan where I belong."