Your post is kind of vague, but I think you are doing something wrong with this:
So I set the frame early on (I set very sexual frames right from the beginning) that we can't have sex tonight, so don't even try.
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My point is, you are selling the "let's not have sex" thing in a way that it is an IOD to her. So you are telling her she is cute and stuff, but you are not attracted enough to fuck her. The next day, the girl will be in her bad and have a negative vibe about you. Girls tend to get very negative when things don't "happen".
THerefore, the best thing you can do in the future, is to let things "partially" happen. Like you get really horny, and as soon as your clothes are off you change your mind, because you have to get up early tomorrow and like her so much you want your first time to be "special and romantic".
I have learned that only using the "Hi I am such a socially programmed PUA that I think I should never say or do anything nice" - method. Does not work in the later stages of seduction. It wil alienate you from the girl and you will miss out sweet sex and a great connection.
Work on your seduction game. I know its difficult to show you like her and have the intent of fucking her later, without losing your mysteriousness, dominant frame etc. But its possible.
So my advice, as soon as the girls seems to like you. Give her some hints you like her too, let the sex partially happen and use time constraints to postpone.
good luck!
Buccaneer