How to Invoke Apathy After a Breakup and Move on Quickly

I spoke a bit on apathy the other day on Instagram and how I feel absolutely zilch for people I dump who disrespect me.

I decided to do an internet search on apathy and alas most of what I came up with picked apart an apathetic mentality as if it's some vein of mental illness like anything else that likely gives people an advantage in terms of skillfully dealing with people.