She took her brother-in-law in when everyone else had neglected him.
But he repaid her kindness by slashing her face, leaving her with a 9cm permanent scar on her left cheek.
"I was always behind him. I was his guiding light," said Ms Priya (not her real name).
"How could he do this to me? I had provided him with so much support and was his good friend."
On March 25 last year, at about 8.45pm, Tyler Jerome Nanda took a 25cm knife and tucked it behind his back in Ms Priya's Sengkang flat.
He approached Ms Priya, who was sitting on the sofa in the living room, from behind and slashed her on the face.
On Wednesday, Nanda, 42, was jailed for three years and 10 months and given six strokes of the cane for causing grievous hurt to his sister-in-law as well as two charges for breaching an expedited order by criminally intimidating his ex-wife (his second) and stepson.
More than a year later, the scar can still be clearly seen running across Ms Priya's left cheek from her lips to her ear. (See report at right.)
The bubbly woman, who works in an insurance company, told The New Paper at her flat on Thursday evening: "It all happened so fast. I was in shock. Blood was gushing out. I did not feel any pain at first. I didn't know how bad it was."
Ms Priya, who is in her late 20s and has a five-year-old son, added: "My husband just hugged me and told me repeatedly not to look at the mirror."
Court papers said that Nanda was upset with Ms Priya because she had gone for a court hearing that involved his first wife hours before the attack.
Ms Priya said she had gone to support a friend who was also involved in the hearing.
"In fact, Tyler had nothing to do with the hearing apart from the fact that his first wife was involved," she said.
He had warned her repeatedly not to go for the hearing.
Later that day, he called her to ask if she had attended the hearing. They had a civil conversation and Nanda did not appear to be angry, she said.
"I did not notice anything was wrong until he slashed me," she added.