adorable: Amen, thank you. BTW, I was in a rush while I posted so it turned out a bit choppy. My situation wasn’t similar (the friend was my gender, pretty harmful though), only the feelings were.
You’re saying you’re afraid she’ll go back to him. What prevented me from going back was the guidance and chizuk I constantly got. If she ever tells you that she’ll just text him “once”, or send a letter or any form of contact just to tell him “one important thing that’ll show him it’s over” please, PLEASE DON’T let her! She was drawn to him for a reason and the reason’s still there. She must sever ALL contact with him. Try giving her some of the love and care he showed her to compensate for that.
B’hatzlacha.