Are these people that you obsess over and your moods are dependent on how they act? 

I have a person who I reaaaally like and think about a lot, and my mood is entirely dependent on her. If her tone changes, I'm down and very depressed. If she's flirty and talks nice to me, I'm happy. My main communication with her is through Facebook, and I have deactivated my Facebook. I get the urge to reactivate it to speak to her again sometimes, but I feel fine without her in some way? She replies to EVERY single message of mine for some reason, even if my reply is just an emoticon. I don't want her to feel like she has to reply to every message of mine. I have even told her that she doesn't need to reply to me all of the time. I'd get mad, yes, but I'd deal with it. I have even stopped replying and left her on read a few times, and she has, too, but replies several hours later. When she doesn't reply and leaves me on read, I do get upset and start devaluing her. Things like: "can't be bothered with you anymore then," "I don't need you anyway", etc, and when she replies, I'm all happy again. I do not say these things to her directly as to not cause drama and hurt her feelings but I do say them in my head. Me and this girl aren't close, and I do wish she'd open up with me more, but looks like that won't ever happen. I even have suspicions that she doesn't really like me and just feels sorry for me. I used to get angry when I saw her online most of the time but didn't reply to me until several hours later. I feel really bad, because this is a lot of pressure to put on her and I feel she's better off without me in her life.

Is this what a FP is?