The last girl I was with was an INFP. From my own personal experience I can tell you what I've gained from being around an INFP.
When we first met, we were often in social settings consisting of about 10 other people which really got me to understand how Fi works. Just like the guy
said in the video, Fe is a externally harmonizing function. Fe wants the social setting to equate to whatever feeling is being promoted. With an Fi user that's not the case. While I was always striving to keep everyone comfortable, she always had this blank, bland straight faced expression. I thought nothing of it, I thought she was just shy, but she wasn't shy, she was misunderstood. Not to say everyone expressed their feeling, but it was less with her, as if she was the only Fi user there, which was what attracted me to her in the first place.
To me, she was very observant, and mysterious. She never spoke unless being spoke too. She carefully watched everyone speak as if she was absorbing their words carefully. I never knew what she was thinking, but I could always feel it. As @
Misadventure said, i could see how it can come across as frustrating to some INFJs, but to me that wasn't the case. Being an auxiliary Fe user, I'm used to being able to picking up on peoples emotions and having a sense of what they are thinking with Ni. With her? Nothing. And I liked that. I like the challenge of not being able to predict what someone is feeling or thinking, it's very puzzling. It actually drives me insane, call me a madman, but I liked it. She finally spit it out that she liked me, after me over analyzing her bland expression for a few hours. What a relief that was. Was a big plus seeing as if INFPs are VERY private with their feelings.
Fi users don't want to promote external feeling just because everyone else is. Fi is an internal framework.
They want an authenticity with themselves first, then everyone else.
Fi is like screaming "Understand me first, so I can understand you."
Fe is like screaming "Let me understand you first, so we can understand each other."
The Fi user can also be very temper tandrumy like Misadventure said. If they feel something goes against their morals,
they'll often defend it, even sounding aggressive in their tone at times, even if it's not meant to come off that way.
The Fi user is also very unforgiving/forgiving at the same time. INFPs like to often compromise after being hurt by someone,
for whatever reason. They'll most likely hold it against you unforgivably, but want to extend the relationship you have no matter
how bumpy and bad it can get.
Fi is quite a complex function to understand imo, I'm still learning about it myself.
The INFJs shadow/6th function is Fi, and depending on the health state of the INFJ, they can sometimes tap into Fi
(being a critical parenting function), and be confused about what it is, and what they are feeling. This can also lead to
a lot of INFJ mistyping, and often comes throughout some types of depression.
