Makes sense, she blames the current state of her life on not embracing the MCs love and wants to "rewrite" that decision.
She is a bit of a nutjob, but that's what makes her an interesting character.
Also i would like to point out that despite being nuts, she mostly keeps under control and behaves well, we get that she's possessive and jealous from her "thought bubbles" but in terms of actions she keeps it together, she doesn't attack the MC for having a relationship with Cara/Nikki or Layla despite her jealousy.
Only Alexis crossed her threshold and made her explode.