ForShannen Doherty, reuniting with her formerBeverly Hills, 90210costars after 15 years has been quite a memorable experience.

“It’s always interesting to get back in with a group you have so much history with,” Doherty, 47, tells PEOPLE. “We can see how we’ve grown, or not grown. It’s a very interesting dynamic to be around.”

Kurt Iswarienko

Shannen Doherty

Being back on set with her costars also gave Doherty the chance to address long-standing rumors of feuds and bad behavior that plagued her during and after her 1990-94 stint on the show (the series ended in 2000).

“I have felt misunderstood my whole life,” she says. “The only difference is that now I’m okay with it. But there have been moments where we’ve been able to talk about things.”

Continues Doherty: “Somebody had a problem with me being late, but perhaps they didn’t know I was late because my dad was in the hospital, or maybe because I was in a horrible marriage. I didn’t share, or I wasn’t asked. I’m not saying it was all a misunderstanding, but a large portion of it was a misunderstanding.”

The cast ofBH90210.Brian Bowen Smith/FOX

BH90210

Now, “I mentioned what I was personally going through back then and some of the cast members went, ‘Oh my God, what?’ ” says Doherty. “It was very interesting having those conversations, not just about me but about what they were going through too. And really understanding each other this time around as adults.”

Those moments, “have been very organic,” says Doherty. “There was never any sit-down, like hey let’s talk about this. It was just, we’re adults, we’re in a different place. You kind of start over, but you start over closer.”

But Doherty says the whole cast is still struggling to come to terms with theabsence of Luke Perry, who died suddenly of a stroke on March 4.

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90210

“Luke was so quiet, but his death had such an enormous impact,” says Doherty of Perry, whom she says was the reason she ultimately signed on to do the reboot. (She also filmed an episode ofRiverdale, which pays tribute to the late actor, who starred on the series.)

FilmingBH90210without Perry could sometimes feel “like a jigsaw puzzle that wasn’t coming together,” says Doherty. “Because one of the most important parts of the puzzle was gone.”

BH90210airs Wednesdays (8 p.m. ET) on Fox.

source: people.com