Jax Taylor is clarifying a few things after filing a response to Brittany Cartwright’s petition to divorce.

A statement given to PEOPLE on Wednesday, Oct. 2 via his rep read: “Jax and Brittany have already long resolved all matters related to custody of Cruz, and will continue to work together privately for the best interest of their son, which remains their overriding concern. While Jax made errors in filing out forms that are usually done by trained legal professionals, those errors will be amended without delay.”

The “errors” the statement referred to were in Jax’s Sept. 26 response to Brittany’s Aug. 27 divorce filing, where she requested primary custody of their 3-year-old son Cruz.

In his response, which was obtained and reviewed by PEOPLE, Jax incorrectly said that he and Brittany were not legally married. The timeline of their relationship was also incorrect. He also checked a box indicating “other” when it came to determining child support, leading to some confusion.

However, in his Wednesday statement, Jax said the couple had previously figured out Cruz’s custody arrangements.

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One day after Cartwright filed for divorce, a source told PEOPLE that the couple — who met and wed on Vanderpump Rules — knew the split was imminent and are focusing on co-parenting going forward.

“This step has been a long time coming and something Brittany knew she had to do for the best interest of herself and her son in order to move forward and put a stop to this tumultuous cycle they’ve been living in,” the source said. “Jax is feeling mixed emotions. He knows this is ultimately the right decision but is sad that things ended up the way they have. It’s an emotional month for him and he’s trying to stay strong for his son.”

They added: “Their main priority is getting to a place of being amicable co-parents for their son and this next stop will hopefully move them closer to that goal.”

In September, Cartwright spoke with PEOPLE about the divorce, echoing claims she wanted to have a healthy relationship with Taylor in the future.

“He’s a great dad. Great dad, terrible husband,” she said. “I’m not ever going to take Cruz away from him. We will always put Cruz first and we are going to work towards a healthy co-parenting relationship.”

“It’s going to take some time,” she continued. “Still, things are very raw between us, but for the most part, I do know if I needed something, if Cruz needed something, I could call him and he would be there for us.”

The pair first revealed they were “taking some time apart” in February on their joint podcast When Reality Hits. Noting that the breakup was “very hard to talk about,” Cartwright said she was taking things “one day at a time.”

“I know on my last podcast, I alluded to many marriages go through rocky times,” she explained. “Yes, marriages in general are very hard and I’ve had a particularly rough year this past year. Jax and I are taking time apart and I made the decision to move into another home to take some space for the sake of my mental health.”

Taylor also addressed the separation and his behavior in the relationship on the podcast, calling himself a “narcissist.”

“I am a narcissist, yes. I breadcrumb, I love-bomb [and do] gaslighting,” Taylor said, listing phrases and behaviors he recently learned. “I’m missing some but I do all these things. I had no idea there were terms for these things.”

“I look up the definition for all these new terms and I’m like, ‘Oh my God, I do that. I do that too,'” The Valley star explained. “I don’t even know how to talk anymore without being labeled as one of these things. So yes, I have to humble myself and say, ‘Do you think you’re a narcissist?’ And I do. I don’t know how I became one.”