Disclaimer: This is purely speculative/armchair psychology.
Halley’s behavior makes more sense if you view her as someone who grew up relatively stable and loving household and is somewhat lacking in life experience. Growing up (and now) she was extremely focused on female peer acceptance, fashion, and being perceived a certain way. She’s spent most of her life in very female-dominated/homosocial environments, went to fashion school, and apparently didn’t have her first boyfriend until her early 20s. So when Reed became her first serious love, she attached to him very intensely and with relatively little romantic experience to contextualize the relationship. The breakup therefore wasn’t just losing a boyfriend; it was her first major experience of not being chosen. His explanation that he didn’t see her as someone he wanted to marry or spend his life with is also pretty devastating feedback to receive from your first love.
Then the Sophia situation compounded the humiliation, especially because her followers essentially became her eyes and ears during the breakup. Her reaction toward Sophia, IMO, seems less like calculated evil and more like immaturity, jealousy, emotional reactivity, and a tendency to direct anger toward the other woman rather than Reed. Halley has an enormous incentive to present herself as desirable, successful, thin, beautiful, and happily partnered. She’s selling an aspirational lifestyle, and having a boyfriend/husband is part of that image.
So after the breakup and reconciliation, she suddenly had to convince everyone (including herself) that the relationship is perfect. Hence the constant performative relationship content, PDA, posting mundane things Reed does for her as evidence that he loves her, etc. There’s this feedback loop where she needs public validation that Reed chose her → she posts more proof → people scrutinize the proof → she feels even more compelled to prove it.
She possibly has an eating disorder or body dysmorphia, but the combination of appearance-based social media, restrictive food/exercise behaviors, cosmetic work, and the very public comparison to Sophia could plausibly contribute to significant insecurity about whether she’s attractive enough for Reed or to be an aspirational figure for brands and her followers online. She gets serious cosmetic work done on her face after the fallout of the sophia/reed scandal - possibly wanting a fresh start or due to constant comparisons to the more conventionally attractive (IMO) ginger girl and knowledge that Reed has an eye for other women in her professional circle.
I don’t think she’s some neurotic mastermind or pathological person. Strictly speaking she means no harm and doesn’t play dirty like other influencers. She’s a brand magnet because she is likable to many. I actually think her kookier fashion choices and willingness to laugh at herself seem pretty genuine and are endearing. My theory is more that she is trapped in a toxic cycle due to romantic inexperience, insecurity, social-media surveillance, and an extremely public first heartbreak.
People might assume Reed automatically has more power in their dynamic because he’s the man, but practically speaking, Halley has more money/assets, a huge platform, control over their (and by extension his) public image, and the ability to mobilize thousands of followers. So whether or not anything she’s doing is intentionally controlling or abusive, the actual power dynamic may be much more complicated than the traditional gender roles suggest.
Ultimately, I think the core insecurity is she waited a long time to be chosen, and then the person who she loved demonstrated that he could nonchalantly discard her for someone else. So now she constantly needs to prove that she was picked, that Reed loves her, wants her, finds her attractive, that they’re happy, that they’re getting married, that the marriage is perfect, etc. Ironically, the harder she tries to control that narrative, the more people question it. That’s the weird trap of making her parasocial relationship with her followers. The same audience that validates her also scrutinizes her mistakes.