As with any cartographic analysis, we begin by asserting the map and the terrain; in this case self map and self terrain. What other literature discusses as identities we identify as self maps, and assert that the self terrain is real and exists beneath self maps.
Relationships are not self
Most people make the mistake of ascribing relational maps to their self map, incorporating their job, status, role, etc into their identities. They then observe that these things change over time, and some conclude that therefore the self is fluid or illusory. This is actually evidence of cartographic error, given the conflict is always in the map.
To find your self terrain, consider that which is invariant as your relational context changes. Your face, your gender, your orientation, your neurotype. These things, and other such invariants, you carry with you across all your relationships, and are true aspects of your self. The honest cartography of the self builds self map, aka identity, on these things alone, and not on relational maps. As such, the honest cartographer recovers from relational change faster, because it does not impact the cartographer's identity.
Jungian psychoanalysis
Those who fail to recognize their self map as just a map, are subject to Jungian psychoanalysis. The terrain signal poking them is what Jung calls the shadow, and his advice to sit with one's shadow is equivalent to attending to one's self terrain. These minds are prone to eventually undergo Enantiodromia, which he defines as "the emergence of the unconscious opposite in the course of time."
Cartographic analysis reveals that the map realist mind struggles to attend to the terrain, so when the terrain signal becomes too strong to ignore, the map realist reaches for the opposite map, and begins clinging to it instead. The map realist remains a map realist, however, and so the cycle starts again. It is not a question of if the terrain signal will get strong enough, but when, because while the map remains static, the terrain continues to move, evolve, and change. As it does, the gap between map and terrain grows, and cartographic debt increases, until it grows so large that cartographic bankruptcy occurs. This is when the map realist reaches for the opposite map.
Cartographic security
The cartographer attends to self terrain more frequently, and manages cartographic debt more responsibly. As such, the cartographer rarely experiences cartographic bankruptcy, and achieves cartographic security.