<human>: Can you condense the text into three sentences or less?

So here is the situation, my wife's best friend was in an abusive relationship. I'll save you the details, but basically this women's SO coked her and tried to kill her. Now my wife and I are letting her stay at our house so she feels safe.

The problem is that she keeps taking calls from they guy. It's nice for about 5 minutes and then it's an hour screaming match. He yells so loud you can hear his side of the conversation even though he isn't on speaker. I have two major problems with this:

1) I'm very concerned that this is the first step of them working it out somehow. If this happens, I think it will be just a matter of time before he actually kills her.

2) Every time she calls him he gets all wound up. Now he doesn't know exactly where she is, but it's not a difficult guess. This creates a very dangerous situation for her and us.

Has anyone else been in this type of situation? Do you have any advise?
<bot>: Wife's friend has a crazy ex, but she still talks to him even after being abused. Worried about her an our safty. What do?