I feel the same way. I think it's because she always changes the story without ever properly explaining why. When she was with Alex she always emphasized how good of an effect he had had on her life, how she was lost but then he helped her find herself again. After that ended, it turns out he destroyed her self esteem. Then, all throughout her relationship with Pete she pushed the narrative that he was the perfect Disney prince love of her life, who rescued her from her disastrous, worst relationship of all time with Alex. After they broke up, however, Pete was suddenly her angry villainous boyfriend who she had a disastrous relationship with. I totally believe that their relationship was never as perfect as she tried to make it seem, but it was jarring that she never talked about why she apparently created such a false depiction of what that relationship had been like. Beyond that one comment when she explained that she used to compensate for the problems in her relationship with Pete by pretending they were the perfect couple on the internet. Then, with Oliver, she was finally in her first "really nice" relationship with the "really nice guy" that might actually lead to marriage. She didn't share as much about their relationship because she was finally content and didn't feel the need to prove anything. Except, now we find out that Joel is actually the first guy she's ever been on the same page with when it comes to plans about the future. Because it turns out that when she was saying her and Oliver might get married one day that was just false. And Joel is now actually the love of her life because they 'love out loud' and post each other constantly. So let's all just forget that her little posting with Oliver was supposed to be a sign that they were settled and happy, that's now not true. Now, constant posting is not a sign of insecurity anymore but a sign that she's found true love and is being herself.
It's a mess.
And she never explains whether she was actively lying to her audience about the way her relationships actually were when she was in them, or if she was just delusional, and why.
With every new relationship she just expects her fans to accept that this relationship is the real deal, her "actually" happy relationship with the real love of her life, and to just forget about the last time she told them to believe that. With every relationship she's finally being herself, unlike in her previous relationship. If she could actually honestly reflect on why she has this pattern of presenting an idealised depiction of her relationship only to reveal that that wasn't reality, then I could maybe believe her insistence that her relationship with Joel is the real deal now. Like, if she could be more reflective about what insecurities drive her to create these narratives on the internet and be in such a deep denial, and how she's worked on that, then she might be more convincing now. But at this point she's the boy who cried wolf to me.