Not he/she/they but "the borderline"
The borderline imagines this elaborate fantasy to be necessary
the borderline turns to clinginess
the borderline may exhibit narcissistic symptoms
the borderline the borderline the borderline

the borderline-
a chalk marking on the sidewalk

the borderline-
trees separating territories

the borderline-
a sign stating do not cross

not me
I am human

but since I'm a 'borderline'
you wouldn't know that

would you?