It's only natural to care about someone you loved dearly and the r/s didn't work out.
It's natural to first and foremost care about yourself. We are not very good at doing so, they are excellent in doing so. You wrote "love" in past tense, they don't love us anymore and there is no relationship anymore. They are only doing what is natural, and are extremely good at it due to preconditioning.
Having empathy to your former best friend's pain is independent of being happy and moving on.
What you are describing is rather "sympathy".
Wiki:
"Empathy refers to the understanding and sharing of a specific emotional state with another person. Sympathy does not require the sharing of the same emotional state. Instead, sympathy is a concern for the well-being of another."They don't share your emotional state, as they already detached. If they indeed do
sympathies with your emotional state, they are showing the most
compassion, by not engaging with you or showing emotions.
Wiki:
"Compassion is the emotion that we feel in response to the suffering of others that motivates a desire to help."As they are the trigger of our suffering, they are not helping by engaging you.
In reality, it is perfectly normal NOT to care, after a breakup. If they had cared, the relationship wouldn't have ended. My ex certainly couldn't have helped me. The only way she could have shown
sympathy, empathy and compassion (in that order) would have been by not breaking up with me and finding someone else - clearly something she wasn't willing to do... . She chose to care about herself. Her way of doing so, logically or not, from my point of view nevertheless.
And if they don't, well it's quite sad.
Sad for us and equallysad for them :-/
But it's theirs and we cannot change it.
So the challenge is to accept that even without being able to rationalize it.
It's sad for both that it didn't work out the way both parties wanted. Indeed the challenge is to accept it... .