her fiancé cheated, now what?

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About a month ago, my friend found out her fiancé has been cheating on her by connecting with women through a video game streaming community. She and I are not super close but she has been leaning on me for support. I'm more than happy to be there for her but twice now she has called me in a panic saying she's determined to leave him, and asks for my help to move her out of the apartment. Both times, I have let her know that I am on my way and (both times!) she has texted me in ALL CAPS: "Dont come. I'll call you." What scares me is she never calls, like she promised, so I have no idea what is really going on or why she decided to stay with him. I'm worried he might be controlling her (I am also worried she might be lying to me) so, once, I threatened to show up at their apartment If I didn't hear from her. Because of that, She did call me and then promised to do lunch but has repeatedly rescheduled. I'm really hurt that she keeps taking advantage of me but I'm also really, really scared for her well bring! Do any of you have advice? How can I get my friend to be honest with me about what's going on without putting her in an uncomfortable position?