Not only do they NOT care... .but they continue to hurt people. The guy she's with now has NO IDEA that she's reached out to me several times since being together... .and continues to put out on her facebook page little messages intended for me to know that she misses me. He has no idea. And I had no idea that she likely did that to him when she and I were together.
EVIL
This is the way I see it. My BPbf knows exactly what hurts me. I have told him many many times the behaviour that causes me pain. He knows. So even if he somehow doesn't understand it (honestly, anyone should), he still knows and I would expect him to take it to heart and change those behaviours. He never does. NEVER. He just repeats it over and over again.
As for the other guy and the messages on FB about missing you. Hmm, well my bf and his ex broke up 4 years ago. He told her to move on and eventually she did. It wasn't until she was in a relationship with someone else that he suddenly wanted her back and tried for over a year to convince her to take him back. She didn't and is now married. Yet he still goes to view her FB page almost everyday (they aren't friends on FB or real life anymore).
I said it elsewhere here today, but will say it again. They always appreciate you when they no longer have you. It would seem that for a BP person the grass is always greener on the other side. Sad but true.