First of all sorry for my english

So i'm hooking up with this FWB for 2 months now, we were yesterday at my place having fun and relaxing and suddenly "the talk" started like this.

- I think we should talk about where all of this is going.

-Aha

-I'm fine casually dating and i don't want this to go further right now, if we both know someone that we like better we can't simply say it to each other, right? i want to know what you think

-Awesome, we are on the same wavelenght, let's keep things like they are.

After i say that, her face completely changes, she gets mad and replys with: "You don't understand anything" then stop talking.

I don't play with this kind of bullshit so i go to bed without saying a word, 20 min later she comes and we end up having sex as nothing happened.

This kind of thing never happened to me before, agreeing in this situation and the other part getting mad, i'm only curious about what you people think about this behavior, shit test? she's nuts?

Cheers!