Heartbroken friends have lifted the lid on the tragic real story behind the two alleged victims of a so-called love triangle that ended in a double murder charge.

Anaseini Waqavuki, 38, and Epi Naitini, 30, were allegedly stabbed to death by Ms Waqavuki's former partner, Anare Vunitabua, 47, at her Quakers Hill home, in Sydney's north west, just before 5am on Sunday. 

But now it's been revealed Ms Waqavuki's 'new boyfriend' who died alongside her was just a happily-married mate, with a wife of his own back in Fiji - and not in a romantic relationship with his close friend.

Neighbours called police to Illabo Street after hearing screams and a commotion, with officers allegedly finding Ms Waqavuki dead in the kitchen with multiple stab wounds.

Mr Naitini was discovered lying on the footpath outside with stab wounds to his stomach and hands. He was rushed to Liverpool Hospital, where he died hours later. 

Vunitabua, 47, was arrested after presenting to Blacktown Police Station later that day. He has been charged with two counts of murder and is in custody as his matter remains before the courts. 

NSW Police on Sunday said that they believed the two alleged victims were in a relationship and Vunitabua was her ex. 

Rumours have since run rife on social media that Mr Naitini must have been cheating on his wife, Ilisapeci Naitini, who lives in the couple'sFijian island home. 

However, Ms Waqavuki's best friend Alisi Tuilevu told the Daily Mail the initial information provided by police was incorrect and the two alleged victims were only friends. 

Anaseini Waqavuki, 38, and Anare Vunitabua, 47, (pictured together) were in a relationship for six years before she broke things off two months ago 

Epi Naitini, 30, was allegedly murdered in the double stabbing on Sunday 

'Epi was only a friend to her and myself,' she said. 

'Epi did not move into her home. They were not housemates. We were all friends. 

'He is married with children.' 

Ms Tuilevu said Ms Waqavuki, affectionately known as 'Nada', was in a relationship with Vunitabua for six years before breaking things off with him two months ago. 

She said her friend had tried numerous times to previously end the relationship but she loved him and he would always promise things would change for the better.

'Nada had a huge heart and was full of forgiveness, so naturally she would forgive and take him back,' Ms Tuilevu said.