Tristan Thompson has admitted to cheating on Khloe Kardashian for a third time, saying he and Maralee Nichols, who claims he fathered her newborn son, had a sexual relationship that lasted for months. The admission comes after Nichols, who gave birth to a baby boy last week, sued Thompson for child support, saying the pair conceived a child together in March.

In court documents published by The Daily Mail, Thompson wrote he and Nichols did “not have a serious ongoing relationship” as she claims, but rather had sex sporadically between December 2020 and March 13, 2021. Thompson added, the two “did not have sexual intercourse in California during that time.”

In his filing, Thompson said he met Nichols in “late November/early December 2020 at someone’s home” and that she did come to his house in California “on maybe two occasions during that time.”

“[Nichols] constantly used the term ‘hook up’ to describe our relationship which was the reality,” Thompson said. “I am certain that if the child is deemed to be my child that the only date of conception was March 13, 2021, because it was my birthday.”

He continued, “Our relationship was based on sex. We would not have seen each other in Houston if we were not going to have sex. We did not have any dates in the traditional sense at any time; there were no dining at restaurants, going to movies, travelling or any other indicia of a normal relationship. There was only Snapchats of ‘where’ and ‘what time’ we would hook up and what hotels would be used.”

Thompson said he and Nichols “never had any telephone calls, emails, nor did we exchange text messages,” adding their only form of communication was through Snapchat, where messages disappear once sent. 

“We used Snapchat to communicate to protect our privacy. After a Snapchat message, the message is automatically deleted. If either one of us would do something to try and save the message, the other party would be notified. I was never notified that [Nichols] saved a message from me.”

Thompson denies sending messages asking Nichols to have an abortion and saying he plans on retiring from the NBA, so she won’t get much money in child support. “[Nichols] has attached to her papers many Snapchat messages which she claims are ‘real’ and represent ‘real’ communications between us. However, I strongly content that these messages have been fabricated by [Nichols],” he stated. 

During the time that Thompson admits to having a sexual relationship with Nichols, he was publicly dating Khloé Kardashian, with whom he shares 3-year-old daughter True. At the time of his 30th birthday, when he says his child with Nichols could have been conceived, Kardashian was publicly wishing him happy birthday and calling him her “best friend.” The pair have had an on-again, off-again relationship (mostly due to Thompson’s infidelity) and last split in June, which was the same month Nichols filed her initial lawsuit requesting “reasonable expenses of pregnancy and birth” as well as legal fees from Thompson. According to E! News, she is also seeking full legal and physical custody of her son, while requesting that Thompson be granted visitation rights.

Amid the current drama, a source told PEOPLE Kardashian is “moving on” and focusing on co-parenting her daughter.