Fi is subjective feeling, Fe is objective feeling. They make judgements and assumptions, that is all.
Fi pays attention to their internal sense of whether something feels harmonious or discordant, good or bad, or whatever their internal feeling about something may be. External factors take a backseat to this internal feeling.
Fe pays attention to external factors: the emotions and needs of others and social consensus. It makes judgements based on these external factors.
@gromit Well, I didn't know about it, thanks. I did a test online and seems that my preferred love language is "quality time" followed by "physical touch". What's the analysis? Is it representative of Fi ?