Like Amy said: It's totally okay not to accept the calls. Once my sister was really in the throes of withdrawal behind bars I stopped answering, it was too jarring emotionally to listen to her. And that's exactly the thing: I was emotionally a wreck about it, and she was only worried about getting out, she didn't give a whit what I or anyone else was feeling. It's a very one-sided, draining relationship. It's definitely okay to take a break from it.