A sister who you are in contact with twice a week is a blessing in your life that you don't want to lose. Boyfriends come and boyfriends go, but sisterhood lasts, if you take care of it.

No, you don't discuss her boyfriend. Since she is in a bad way, you let her talk about whatever she wants to talk about. Don't even bring up the boyfriend, if she doesn't. If she seems to not have much to talk about, then you just make pleasant chit-chat. Talk about the little ups and downs of your own life . . . nothing too heavy.

As she is leaving, you say, "I am here for you no matter what."

This all may sound like avoiding the elephant in the room. Sometimes that is the right way to handle things. Otherwise she is just going to avoid you, like she has been doing. She doesn't want you judging her. She knows she's in a mess. She knows better than you do. Do you think this bonehead boyfriend is any prize to live with? For whatever reason, she is not ready to let go of him. She will when it feels right for her. That's her right. Someday, she will love you for respecting that.