My old therapist Missed my bipolar. She only saw we when I was sad. She never saw the flipside and mania. Also My old Psych.

So she may have thought I was BPD. Old Psych thought it was depression that came and went.

Nope Bipolar 1.

So, yes they can be confusing. Especially when you go to therapy, sporadically, like I used to before this diagnosis.