"Black and White" I can relate to. He always says that there is always a grey. There will always be grey. You just choose to see the black or the white. Now, I am trying to understand if he means: you see the extremes of things. There IS a happy medium. It's just kind of astray from your mind.
I can't say I know. But I have heard the same words spoken to me.

I believe everyone has BPD like symptoms but not necessarily have BPD. Not only do you see black or white, it depends on how you react to the black or white. my emotions depends a lot on black or white.. i struggle to find the gray, just to be content on something and chill, not to overthink and not allow those emotions to make me take inappropriate actions like I have in the past.

example: my husband looks at me serious and is quiet around me.
gray would be "oh he must be moody or tired whatever..."
black is where I go... "OKAY! He has finally got tired of me and hates me, he is sick of me Im probably looking fat, Im leaving now!! there is no point in being here any longer!" cry and cry, pack my bags and do some stupid impulsive thing. (I have done that) and I could do it again.. even though I know its in my head, at the moment of thinking it it is too real in my head to ignore and the more I try to see gray the more anxiety I get and more out of control my emotions become.