Should I be secretly stalking my recovering anorexic friend's instagram. I found out that she had a crush on someone
What would you do with the new knowledge?
I will tell him about my friend's crush on him.
Don't stalk your friends online. That's just creepy behavior. She will think you're a creep if she found out.
It's fine because I'm thinking of keeping her secret.
It's good that you decided not to share her secret, but you should really put an end to the stalking also. If she's your friend you should be able to just have a conversation with her instead.