As someone who used to be poly, I agree 100%. Poly people can be emotional wrecking balls if they don't put in the work to build and maintain healthy relationships. Poly drama story time!

The worst of my poly primaries believed she had infinite love to give, so she saw no reason to limit herself to one partner. While her love might have been truly infinite, her time, emotional capacity, and sense of commitment were not. She frequently overextended herself with multiple new interests and had her desire for attention and validation fulfilled far beyond reason without the capacity or apparent intent to fully reciprocate.

Her interests were typically less socially adept men who didn't have much luck in dating, so they threw themselves at a charming, intelligent woman showing intense emotional and sexual interest, unaware or uncaring that she hid her flaws with equal intensity. (She had this thing about fucking virgins: hey, I don't kink shame!) I saw her break a few hearts when they realized they weren't going to "win" her for themselves, but only toward the end discovered that this wasn't due to self-delusion as she claimed, but instead her failure to clearly communicate firm expectations and boundaries. Sometimes that they weren't communicated at all. I also learned after the split that there were far more men than I knew about. Uggggh.

Eventually she began breaking the rules we established for our relationship and chose to leave me when I insisted we close the relationship to work on ourselves, as we promised to do when we first became committed. She opted instead to begin fucking two mutual friends, one of which immediately ghosted me while the other, a newly former virgin, soon called off our friendship so he could, in his own words, "have a clear conscience while pursuing a lasting relationship with her". I'm sure I don't have to explain how successful he was.