A BPD sure can hide their true selves my ex sure could nobody knew about her dark side, she showed it not too me not too long after we met. Its always fun to get lashed out at, one minute she was fine the next she's p*ssed at me for no reason. The term empty shell is very true I wished she was the person she portrayed in public the bubbly happy young woman. Her happiness was always short lived no matter how much she tried to be happy it never lasted.
The guy she replaced me with I'm pretty sure is a narcissist he wanted her bad she wanted him for money she claims she loves him its probably all a façade like the rest of her life. She loves animals namely dogs more than humans she values her dog more than she values her BF she puts her dog first.
The split up with me shook her up, caused stress in her life she started to get fat, she also aged quite a bit, I didn't put up with her crap, we had some pretty intense fights. Then she went off her nut to get revenge on me she hated seeing that I was happy and she wasn't the smear campaign started.
Life is good she's been out of my life for 2.5 years she can stay out of it too, when she first met me she came on strong she just got out of a long term relationship she claimed she was the victim her ex boyfriend was abusive. Funny thing is she claimed I was abusive when we went our separate ways.
Stay away from these sick women there is nothing you can do for them they are damaged goods.