So I recently got diagnosed (well, more of a statement of "I haven't known you long enough to formally diagnose you with this, but it seems incredibly obvious to me and I'm shocked nobody noticed till now) and have been trying to learn more about how to deal with this all. I see people using the term FP a lot and can certainly see a ton of people I've ended up doing that with, but don't know a lot of the specifics of how it manifests, and how to deal with doing it. 
So, I have a few specific questions but am also looking for a general definition of what you'd consider to be an FP. So! Questions!
• Do you inherently have to feel positively about your FP? I look up to them a lot but they also instill a lot of awful feelings in me and it makes me very frequently irrationally angry at them.
• Can you have multiple FPs at once? idk how literal the "favourite" in "favourite person" is, and though I don't see what would prohibit you from feeling that way about multiple people, I'm not sure if as a community it's generally accepted to just be the person those feelings focus on most.
• How the heck do you stop feeling that way about someone??? I've done so in the past but I legitimately don't know what I did. I just compare our relationship now vs then and realized I've stopped feeling that way about them?