Just detach. Let it end. Accept whatever life brings your way. Not everything is meant to last, and not every story gets a happy ending. Loosen your grip. Stop forcing what no longer fits. Make peace with what's over and allow yourself to breathe again.
Breakups are ok. Starting over is ok. Moving on is ok. Saying no is ok. Being alone is ok. What is not ok is staying somewhere where u are not happy, valued, or unappreciated, that's not ok.
I hope you find a partner that calls you back after an argument; just to remind you that NO MATTER HOW DIFFICULT AND STUBBORN YOU ARE, HE WON'T GIVE UP ON YOU.