what is splitting in BPD?

To split something means to divide it. Those with BPD tend to characterize themselves, other people, and situations in black and white. In other words, they may suddenly characterize people, objects, beliefs, or situations as either all good or all bad.

They may do this even though they know the world is complex, and good and bad can exist together in one.

Those with BPD often seek outside validation without considering their own emotions about themselves, others, objects, beliefs, and situations. This can make them more prone to splitting, as they attempt to shield themselves from anxiety caused by potential abandonment, loss of trust, and betrayal.

https://www.healthline.com/health/bpd-splitting#about-splitting