First ask your daughter if she wants to talk to you about her boyfriend. If she says yes, then ask if she wants to hear your thoughts about him. Let it be her decision. Don't force your opinions on her if she's not ready to hear them. If you do that, you will only push her away. Tell her that you are there for her the day she wants to talk about it. That way she knows you want to support her and won't feel criticized. Hopefully, you can have a constructive conversation that will help her deal with her situation. She might also need help taking care of her finances so that her boyfriend doesn't take advantage of her.