Imagine what it would actually be like living with your oneitis. You have to be brutally honest with yourself about this, or it won't work.
If you really think about it, other than the sex, it'd mostly be awful. She'd be constantly expecting you to improve yourself in various ways, constantly expecting you to be better, constantly expecting you to work your balls off, and for what? Just so that she'll keep "letting you date her".
Meanwhile, Chads would be hitting on her every time the 2 of you are in public. Chads that are lazy. That aren't working even 5% as hard as you. And she'd probably flirt with these Chads. In front of you.
Women are horrible people for the most part.