Just because there's another guy after her doesn't mean that she's just not going to be able to help herself and suddenly start having sex with him even though she doesn't want to. Women have brains. Don't approach this like a competition, where the guy who puts the most effort into things automatically gets the girl at the end.
If she said she wants to stay single for a while and not have sex, then thats what you should do. If she says that but then gets with this other guy, then maybe she just wasn't as into you as you thought.
Either way, I don't think you need to "do" anything. Let her figure out what she wants, and just go with it.
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Anamnesis
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