Brian Austin Green and Tori Spelling are reflecting on the 18-year hiatus in their friendship.

The former "Beverly Hills, 90210" co-stars chatted on Monday's episode of the "Oldish" podcast and revealed they didn't speak to each other for nearly two decades after the show ended.

Spelling, who played Donna Martin on the teen drama series, shared that she was in tears on set when "90210" wrapped because she was afraid that she and Green, who played David Silver, would lose touch.

"We were so close," she said. "We had grown up together, and we were such good friends. It was almost like going through a divorce or something. Like, 'Oh my gosh. Time to move on, but also, I'm losing that human that I'm with every day and have that connection with, and what's gonna happen now?'"

Spelling recalled Green assuring her that they would remain friends and would "always be together" and "go on vacations together." In reality, this was the "last time we spoke for 18 years," she said.

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The two actors both told their side of the story while trying to figure out what happened. Green said that from his perspective, he tried to keep the friendship going, but Spelling didn't seem interested. "I just never got that from you," he told her, recalling a time she "never said hello to me once" at a "90210" DVD release party.

"It was just this thing of like, 'Oh my god. She just does not want to be my friend anymore,'" Green said. "I genuinely felt that. Because I felt like I've lived up to my half of the bargain. I've really tried to visit her. I would call you. When that wasn't reciprocated, at some point, you just kind of give up and you assume, 'Okay, well maybe something's going on and so she needs time.'"

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For her part, Spelling said she "shied away" from Green because he was "not a fan" of her relationship with her boyfriend at the time, Vincent Young. Green agreed that he didn't think this was a "good relationship" for her. Spelling, meanwhile, was frustrated by Green's own relationship with his then-girlfriend, Vanessa Marcil.

"It was frustrating to see from a friend's perspective that loves someone so much ... and see what's going on and see how your friend is treated, and not feel OK with it, but knowing that you can't really say anything because the person has to go through their own experience," Spelling said.

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Even after Spelling and Young broke up, the actress said she "never stopped wanting to reach out and reconnect" with Green, but at a certain point, she felt it had been "too long." But the actors said they have come out on the other side of this rift, and they both returned to star in the 2019 series "BH90210."

"We text," Green noted. "We're back to having that relationship that we had, so I love the fact that we can have this conversation now. We won. It's a victory lap that we get to take on this. We made it through, and here we are again."

Last month, Spelling and Green both paid tribute to their former co-star Shannen Doherty, who died at age 53 after a battle with cancer. "I'll miss you more than I know how to process right now," Green said on Instagram at the time, while Spelling said, "I don't have outward words yet … but WE knew and that's what matters."

In an April episode of her "misSPELLING" podcast, Spelling reflected that Green was the "first love of my life."