In my case, my FP is my internet friend. We’ve been talking for about a year and I’m very attached to them. They know about my personality disorder. They put up with all my outburts and intense feelings and don’t seem to have any plans of leaving me. 

I’ve already tried explaining to them the concept of an FP before, but didn’t tell them they were my FP. I’m thinking of telling them, but I’m scared it could ruin things. But considering they put up with me already and don’t mind dealing with my intense moodswings, I doubt it will make much of a difference.