How would you handle this?

My daughter is recovering from alcohol/drug abuse. She's been clean for a few weeks. She hit bottom after leaving the state with her drug using boyfriend only to find that he was very abusive (go figure) whenever he was lit up, which was most of the time. She decided to get clean and move back to our state. He did not take her departure well and is constantly calling her and threatening her. She is living with a friend and managed to get her job back, but for some reason (maybe someone could tell me how) her boyfriend got wind of all this and now my daughter is in fear for her life. She tells me that we should get a restraining order on him so he doesn't do anything to us. To us? My daughter has put the entire family in jeopardy due to her stupid choices while under the influence. I want to help her, but I'm tired and pissed. Am I sick to think that maybe my daughter is so screwed up that she intentionally let her ex boyfriend know where she works and lives? What would be the right thing to do? She's a grown woman now and whatever mistakes she makes is her problem, but I just don't know how involved I should be. Should I cut her off until she has more time of sobriety and maturity under her belt? Am I supposed to hold her hand and guide her on what to do in these situations? I'm so tired, confused and I have lost hope. Can anyone give me some new insight or suggestions on the best way to deal with this? I have two younger ones still at home and I will not allow them to get hurt by this. Thanks all of you in advance for your answers.