It seems that the fights were part of the general nature of their relationship.
"One minute, they'd be all over each other, the next minute, he'd be like, 'We're fighting,'" says Laundrie's friend, Ben Matula, describing their relationship when they were teenagers in Long Island, New York. "They always had some drama."
Matula, who spoke to PEOPLE exclusively for this week's issue, adds: "There was always something below the surface where things weren't 100% wonderful."
"They had times they were toxic and times where everything seemed a lot more healthy," Chen tells PEOPLE. "They had very low lows and very high highs. But they really seemed to love each other. When things were good, you'd be like, 'Why can't I have a relationship like that?' When they were bad, you'd be like 'Oh my God, just break up and spare yourself from the drama and everyone else from having to hear about it.' "
'They Always Had Some Drama': Friends Reflect on Romance Between Gabby Petito and Brian Laundrie