discarding, splitting, or both?

i used to be really close to someone who i was very attached to emotionally due to bpd and dpd, im questioning covert npd heavily and was wondering if this was an example of discarding someone? i just suddenly lost all emotion for her, like i couldn’t get anything from her anymore and found more interesting people who caught my attention more, and suddenly everything about her annoyed me and made me angry, and i blamed everything on her and made her feel like she had no idea what she did wrong. even today, the most i regret is the fact that i don’t have her attention anymore because of what i did because i realize she loved me so much and would’ve given me unlimited praise and attention.