What she means:
You know what makes me crazy? I'm sorry, can I say this? You know what makes me nuts? The fact that we could be together, here together, sharing our night, spending our time. And you are gonna choose someone else to be with, no, you are, yes, Jamie, that's EXACTLY what you're doing; You could be here with me or be there with them, as usual, guess which you pick! No, Jamie, you do not have to go to another party, with the same twenty jerks you already know. You could stay with your wife on her FUCKING birthday! And you could, god forbid, even see my show, and I know in your soul it must drive you crazy, that you won't get to play with your little girlfriends. No, I'm not, no I'm not! And the point is, Jamie, that you can't spend a single day that's not about YOU.
there is no villain in tl5y. both leads are sympathetic but flawed, and in the end, jamie and cathy were both at fault for their marriage failing and they just weren't suited for each other
me to me:
ok but he literally cheated on her and then lied about it before dumping her via a letter instead of admitting what he did and ending their FIVE YEAR RELATIONSHIP face to face because apparently he didn't think she was worth the effort of dumping her in person???