Breaking up with someone requires that you cut off your empathy from the other.
If you don’t, you simply feel their pain, know that you are inflicting it, and feel either horror or shame as a result.
One antidote (if you have the empathy) is to feel it but not care. The only way I can see not to care is to detach.
On the other hand, you might not feel it. This could be a result of detaching before the results are in.
I can detach but it takes a long time. And persistent deterring, because I keep trying to care, but I will eventually give up.