Kathryn Boyd and actor Josh Brolin are reportedly engaged, and Brolin says he’s the happiest he’s ever been.

Boyd, who was at one time Brolin’s personal assistant, began dating Josh in early 2013 after his split from actress Diane Lane, and the couple were spotted in Cabo San Lucas, Mexico soon after with a group of friends and family as they celebrated the occasion.

“They were with two tables worth of people so it was a big group, more than eight people. They had a fixed menu and it seemed like they were celebrating something… It looked like a party and it seemed celebratory,” a source told Us Weekly.

Josh told USA Today recently that he’s in a very happy place following a rough patch that included his divorce and several altercations, one of which led to his arrest in Santa Monica. After reportedly attending rehab, the actor said in the interview that he was ready to put his past behind him.

“There was one point where it wasn’t boring. I grew up that way,” he said of his legal battles. “But if (you) continue doing that same thing, you’re that guy. That’s your identity. I have my own. I know other people who have that stamp, and I’m bored by them….I’m in a totally different space. I’m the happiest I’ve ever been, other than having my kids. I wake up in the morning and I’m actually happy,” Brolin said.

Brolin said that attending rehab helped him see things more clearly.

“It made me think of a lot of things. My mom dying when I was in my 20s. All the impact that had on me that I hadn’t moved past; I was always such a momma’s boy. But I realized that I was on a destructive path. I knew that I had to change and mature. It was like I stepped back and saw the hamster wheel.”

This will be the third marriage for Brolin, who has two children with first wife Alison Adair. He was also engaged to actress Minnie Driver, but the couple called it quits before the big day.