Do y'all tell your FP that they're your FP?

I'm just curious to know if you guys tell your FP. I recently sat down with my good friend (whom is my FP) and I told her about my BPD and that my brain has decided to make her my favorite person.

She was already familiar with BPD so she wasn't unfamiliar, and she was super understanding which honestly helped me regulate my emotions significantly better. I felt the need to tell her, because I was recently self sabotaging because she was distant, so I decided to distance myself from her. Realizing that this was the BPD talking, I decided that it's not worth ruining a good friendship and I'll tell her what's going on.

Does anyone else do this? If so, why? And if not, why not?

I'm curious for interesting discussions because I'm pretty new to this and I'm trying to navigate my way around this