Una Healy sings about leaving a toxic relationship on her new single, 'Walk Away', after ending her three-way relationship.

The former Saturdays star has shared her new empowering single about being free of a "relationship or situation" that is no longer good for you.

Speaking of the new single, Una said in a statement: “Walk Away is about having the courage to walk away from any relationship or situation that no longer serves you, to do it in style and to find the courage to move on to something better. Throughout the song, there is a play on words that keep it humorous and upbeat.”

In an apparent dig at her ex, she sings: "You had my heart in a noose, while you were filling your boots.

"Had a soul, like worn-out leather.

"Now you can step aside (Step aside).

"And I will walk on by, by."

Una recently admitted she felt "hoodwinked" into her so-called throuple with David Haye.

The 41-year-old pop star opened up about her three-way relationship with the former boxing champion and his on/off girlfriend Sian Osborne, revealing that she felt a little embarrassed by their unusual relationship.

Recalling the early days of their romance, Una told the 'My Therapist Ghosted Me' podcast: "It was casual, it wasn't serious. I was happy enough with it. It was in a romantic capacity.

"He was very honest that I wasn't the only woman he was seeing, I was very aware he was seeing other people. I knew he was being honest and it's not like I was being cheated on.

"I knew he wasn't husband material, just a bit of fun and I was enjoying it."

However, their relationship subsequently took an unusual turn, when David asked her if Sian could join them on a getaway.

The songwriter shared: "I remember on the flight over he was in the middle seat and he had one hand on her leg and one hand on mine.

"I said to him, 'what am I doing?' and he goes 'you're having a midlife crisis but don't worry so am I!' and I thought '[Sian's] not because she's ten years younger!'"

Una claims that David, 42, enjoyed the attention that subsequently came their way.

But the singer - who has two kids, Aoife and Tadgh, with her ex-husband Ben Foden - hated every minute of it.

Una - who split from David earlier this year - said: "I think he was very happy about it but I was in bits about it.

"He didn't get it; he was always trying to coach me on how not to get upset but I've never had to hit the block button so much. I had a list of words blocked on Instagram.

"I don't want to be in a three-way relationship!"

Stream 'Walk Away' on all major streaming platforms.