If the police have been informed that her ex raped her and have issued a warrant for his arrest then it is most likely that she had been sexually assaulted by him.
Do you have any idea how many times false charges are pressed, bogus restraining orders are filed by (mostly) women using the legal system as a tool to further their own means, whether its posturing for a favorable position in a divorce or getting the heat off of them when an affair is discovered?
The courts are quick to sign on the dotted line because no judge wants to see his or her name in the morning paper after some stalker murders a victim because they were skeptical about the grounds for issuing a warrant.
That does NOT mean the charges are legit.
The guy has done this before without paying any criminal consequences, so the likelihood of him repeating it is very high.
You don't know what he did before, all you know is that he was "accused" of doing something and he was found to be not guilty.
Now as far as her clueless friend leaving her alone with him, I can see that happening
You can see a clueless friend leaving her alone with an exbf that supposedly raped her. Sure, people are stupid and maybe he was completely unaware of the history and forget about the crazy odds of her former exbf stalker being at the house by some crazy coincidence. She gets there, sees the crazy exbf stalker.. and what does she do.. does she leave? No.
The friend leaves! At which point the woman chooses to do what.. leave? No. She stays there, alone in the house with the crazy ex stalker boyfriend so he can rape her again.
Makes perfect sense to me!