NFL star-turned-killer Aaron Hernandez hid a longtime sexual relationship with his high school quarterback, according to a new report that also said the troubled late footballer was physically and sexually abused as a youngster.

Under their Connecticut school’s Friday night lights, Bristol Central High School tight end Hernandez and quarterback Dennis SanSoucie formed an unstoppable duo on the field — and while off, they also engaged in an on-again, off-again romance carefully shielded from public view, SanSoucie told the Boston Globe.

“Me and him were very much into trying to hide what we were doing. We didn’t want people to know,” SanSoucie told the paper.

Hernandez, who committed suicide behind bars in 2017, after which rumors of homosexuality surfaced, “had a feminine way about him” that his father, Dennis Hernandez, abhorred, the paper said. The volatile dad was quick to discipline his son for not appearing masculine enough, according to Hernandez’s brother, Jonathan.

“‘F—-t’ was used all the time in our house,” Jonathan told the Globe. “All the time. Standing. Talking. Acting. Looking. It was the furthest thing my father wanted you to even look like in our household. This was not acceptable to him.

“I remember [Aaron] wanted to be a cheerleader,” Jonathan recalled. “My cousins were cheerleaders and amazing. And I remember coming home and like my dad put an end to that really quick. And it was not OK. My dad made it clear that … he had his definition of a man.”

The father — a deceased public school janitor who lived vicariously through his sons’ athletics — beat the boys fiercely when they didn’t live up to his expectations, Jonathan said.

Jonathan threatened to call the cops when the dad was wailing on him and Aaron, and the father called his bluff.

“And [Dad’s] response was, ‘Call them.’ And he handed me the phone, and he said, ‘I’m going to beat you even harder, you and your brother, and they’re going to have to pull me off of you when they knock down the door.’ ”

As an adult, Aaron confided in Jonathan that he had been sexually molested as a young boy — though the brother declined to go into more detail. One of Aaron’s criminal defense lawyers, George Leontire, also said Hernandez confided in him about being sexually abused.