I'm wondering if this is really an ISTP trait from me but...
As I tend to be pretty insecure in my Fe, I only trust it when it's sincere.
For example, I had this INTJ who liked to be playful with his Fi, and I had to put energy into my Fe to feed it.
But once something's off, it's ruined.
This is why I want my Fe to be genuine: it costs energy, so use it wisely.
Also because it is insecure, I generally try to take other people into account when possible and reasonable (it wasn't like that in the past though, it's part of self-improvement). But all in all I'm still introverted.
How does this manifest with you?