A 22-year-old Bronx man was arrested Thursday in the horrific stabbing and torching death of a teen, police said.

Adones Betances — who lives about five blocks from alleged victim Winston Ortiz, 18 — was hit with murder and manslaughter charges after being questioned by cops at the 44th Precinct station house.

“I’ve been framed,” Betances shouted as he was escorted out of the station house in handcuffs.

He is accused of stabbing Ortiz three times before dousing him with gasoline and setting him on fire on the fifth floor of a Highbridge building near their homes Wednesday afternoon, according to police.

Sources said Bentances knew Ortiz and walked into the building just 10 minutes before him as part of a planned attack.

The dying teenager identified his alleged killer when cops got to the scene, according to sources — who said Betances casually took his girlfriend out to dinner after the fatal attack.

Tenants in the building said they heard the teen’s screams around 3 p.m. and ran out to the gruesome scene.

Two tenants used buckets of water to douse the flames.

Police said Ortiz was stabbed twice in the back and once in the chest and suffered burns over 90 percent of his body.

He was rushed to Harlem Hospital, where he was pronounced dead.

“I couldn’t believe it,” the victim’s aunt, Victoria Ortiz, told The Post. “I thought it was a sick joke.”

She said the teen was the oldest of three boys and said his family lived with his grandmother in a nearby Bronx building.

“She basically was his caretaker while his mom and dad were at work,” Victoria Ortiz said. “She was a very strong part of his daily upbringing.”

She said she believes her nephew was killed in a jealous attack by his ex-girlfriend’s new love interest.

“Saying girlfriend is too much,” she said. “They probably only held hands. It was like puppy love.

“She only lived a couple blocks away.”

Neighbors described the victim as a recent high-school grad bound for college who kept out of trouble.

“They are a good family, good parents,” neighbor Jose Suarez said. “I cannot say anything negative about them. I never see him getting in trouble. I never see him hanging out in the hallway. I never see him hanging in front of the building.”

One next-door neighbor, a 57-year-old teacher, said she saw Ortiz grow up and said he attended a charter school in the city.

“When I heard what happened, I was shocked,” she said Thursday. “I cried last night. My heart was broken.”

“I can’t believe somebody would do something like that to that boy. He was never mixed up in the wrong crowd.”

Additional reporting by Amanda Woods