Jax Taylor Calls Son Cruz His 'Biggest Accomplishment' as He Admits He's 'Made a Lot of Mistakes'

Jax Taylor's is celebrating his son on his birthday.

On Thursday, Dec. 19, the Vanderpump Rules alum, 45, shared a carousel of photos on his Instagram of his son, whom he shares with ex Brittany Cartwright, as well as a few selfies with his little one. The father-son duo could be seen smiling and posing together in a few photos, while the proud dad included videos of Cruz playing and jumping into a pool.

"I’ve made a lot of mistakes but you are by far my biggest accomplishment son nothing in life makes me happier and want to be better person for you," Taylor wrote in his post.

"You are the best thing that has ever happened to your mother and I. We love you to the moon Cruzy. 💟🦖."

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Related: Brittany Cartwright Calls Son Cruz Her ‘Bestie’ amid Split from Jax Taylor

On Tuesday, Aug. 27, Cartwright, 35, filed for divorce from her husband of five years, requesting primary legal and physical custody of the former couple's son Cruz. Shortly after news of the divorce broke, a source told PEOPLE that Cartwright's focus is on her son as she and Taylor strive to become friendly co-parents.

"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," said the source.

"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."

As Taylor and Cartwright headed into the next few months, the source said they were prioritizing their co-parenting relationship.

"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," they said.

Speaking to PEOPLE in September, Cartwright shared that although the two are prioritizing their son, they still have some work to do when it comes to their co-parenting relationship.

"He's a great dad. Great dad, terrible husband," Cartwright told PEOPLE. "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. 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."

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