As a relationship takes hold, people with the INFP personality type will show themselves to be passionate, hopeless romantics, while still respecting their partners' independence. INFPs take the time to understand those they care about, while at the same time helping them to learn, grow and change. While INFPs are well-meaning, not everyone appreciates what can come across as constantly being told that they need to improve
– or, put another way, that they're not good enough. INFPs would be aghast to find that their intents were interpreted this way, but it's a real risk, and if their partner is as averse to conflict as INFPs themselves, it can boil under the surface for some time before surfacing, too late to fix.
Better Three Hours Too Soon Than a Minute Too Late
This aversion to conflict, while contributing greatly to stability in the relationship when done right, is probably the most urgent quality for INFPs to work on.
Between their sensitivity and imagination, INFPs are prone to internalizing even objective statements and facts, reading into them themes and exaggerated consequences, sometimes responding as though these comments are metaphors designed to threaten the very foundations of their principles. Naturally this is almost certainly an overreaction, and INFPs should practice what they preach, and focus on improving their ability to respond to criticism with calm objectivity, rather than irrational accusations and weaponized guilt.
source: INFP Relationships | 16Personalities