This "person?" used and abused you before leaving. You were his commodity. Its useful life had been extracted. Your intelligence allowed you to see the red flags early on. Your neediness allowed the purported relationship to continue. Now you are grieving and commiserating about the hit to your self-esteem.

For me the real issue is why you hate yourself? You self-loathed before this critter made the scene. You now would not be so exasperated with yourself if you had made your well-being the top priority before risking being hurt by one you knew was fully capable of leaving you a bloody mess.

May you learn to love and cherish who you are.

I wish you well.