They consider you a true friend
I think that the best quality that a friend could have is to listen to what the person [who has experienced sexual assault] has to say. I think listening is a big part of it, especially when we help a friend. Also, being reasonable and empathetic and just a shoulder on which they can lay. Just be there for them emotionally, and help them make the right decision when it comes to like reporting or not. Give them good advice, cause when someone comes to talk to you about their experience, they probably trust you; and you should be like glad that they came and talked to you, because they consider you a true friend.