Former University of Tennessee football star Albert Haynesworth is opening up about his tumultuous relationship with former Lady Vols basketball player Brittany Jackson, alleging she repeatedly used racial slurs and physically abused him.

In a series of Twitter posts on Wednesday, the former NFL star detailed what he called “The Ugly Truth About Brittany,” with whom he has a son.

The football player-turned failed Knoxville burger store owner wrote that Jackson called him the n-word “on numerous occasions” because “she wanted me to feel hurt bc I didn’t show her affection.”

Haynesworth alleged Jackson became “extremely violent where more than 10 times in Tennessee and Florida I … called the police to restrain her.”

One of those calls occurred on Jan. 10 in Southeast Knox County.

Sheriff’s deputies responded about 1:30 a.m. to a home on Kimberlin Heights Road, where Haynesworth said Jackson — who had been drinking wine — kicked the former 320-pound defensive tackle twice in the groin during an argument, according to a report from the Knox County Sheriff’s Office.

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Haynesworth refused medical attention, and Jackson had left the home before deputies arrived, the report reads. Haynesworth didn’t file charges in that case, KCSO spokeswoman Martha Dooley said.

“Yes I have witnesses and bruises but me (sic) for some reason still tried to protect her by not sending her to jail bc I didn’t want to ruin her so called career and name,” Haynesworth wrote in one tweet.

Haynesworth also alleged on Twitter that “MOST” of the money given to Jackson’s Alzheimer’s event “goes right in her pocket. That’s why she wants the checks written to her foundation and not the Chattanooga Alzheimer’s foundation.”

Jackson has organized several celebrity basketball games in Bradley County, where she grew up. The events aim to raise money to help find a cure for Alzheimer’s, which plagued famed Lady Vols basketball coach Pat Summitt until she died in June 2016.

TMZ reported Jackson has accused Haynesworth of skipping child support payments.

Jackson and Haynesworth did not immediately return requests for comment Wednesday.

The 6-foot-tall Jackson started on Summitt’s team from…