How can I help my friend through this ?

I have a friend that is dealing with unrequited feelings from a guy that she likes. Initially, he told her that he just got out of a long term relationship and wasn’t ready to jump into another one. So he said they can friends to see where it goes but his actions doesn’t show that. Me personally, I would’ve been up front and said no I’m not interested instead of leading someone on. I encouraged her to keep her options open instead of relying on his words but she refused. Now, she sees that the excuse he gave was BS and she’s really torn up about it. She hasn’t been eating, she’s saying that she doesn’t want to be here anymore, and I’m really worried. How can I help my friend ?