True although I think most relationships are unstable and have drama particularly when young, which is why people can move through so many. Most people have multiple relationships in their lives until they find someone that works (or keep going). That's seen as normal.
I think there is a bias when people look at poly relationships as they seem novel and if they fail it's easy to say it was because it was poly. But if a 2 partner relationship fails it's "normal" and we accept all the reasons like "I didntnlove them anymore" or "we grew apart" etc.