Much healing takes place when one sees that those that hurt you were hurting themselves badly. You were a victim of their own disillusionment.
Love doesn't "abandon". A person doing that has no love for self and can't love another. That person is hurting just like you, maybe more with the self-hatred of abandoning you.
Everyone is on a journey to reconcile these evils in life. You're trying to regain your mental wholeness so that you can let go and not find your self-worth as "abandoned child". You're not "abandoned child". You are you, the past is gone, today is all you got.
The real problem isn't the abandonment but that you don't love yourself. You don't know yourself. If you don't love yourself then you can maybe imagine the mental torture of the one that abandoned you?
Do you feel self-absorbed right now, trying to find a way out of your pit? Yes, I imagine so. Can you imagine that the person that abandoned you was also in a pit? Is that person's mental health really your identity because abandonment was a manifestation of that person's health?
You got a raw deal, no doubt. Can't change that. You can only change your understanding of self and life and no judge yourself or anyone anymore. If we all knew better, we would do better!
This is a great quote on letting go...my favorite... "Letting Go"...A Beautiful Quote and The Heart of Profound-Self-Help.com