@tniz1987,
Reason #467,000 why I hate FWB.
Because nobody ever knows what page they are supposed to be on.
So! Have a conversation. Not a text. Pick up the phone and go visit or have coffee if you can do so in a fairly secluded and private environment and discuss your expectations.
Be kind. If all you want to do is have a physical relationship, please have the decency to at least be nice about it. And just saying, "All I want to do is **** you." is not a nice way of going about it. Not saying you, personally, would do that, but there are people who would.
Ask what you two are. Dating buddies? More? Good friends? I gotta say, I think she's trying to hint to you that she feels about you what she does about that other guy in that big long text she sent you.
Also, for your own sanity, tell her while you appreciate her friendship, you really don't want to hear about her in-depth problems with other guys. Because even if all you want to do is screw (and get yourself into a situation where you can do so), you still don't need to see that stuff.