Abandonment issues

i never thought I had abandonment issues until my long boyfriend/best friend abandoned me. First i was in denial mode I could not believe that he would leave me just like that, then it came the self blame when I actually thought he left me because there was something wrong with me. Then the victim phase when I blamed him for all my pain, with that came the anger towards him and I began to resent him. I could not understand why he had moved on so quickly and I was still suffering. Then I decided it was time for me to heal. I tried everything and I am still trying. That's how I discovered that the issues I had were also due to my childhood experiences. My father died when I was 4 yrs old and my mother left to work so I hardly saw her at home. Both parents were gone and I did not understand why. I built a wall against people to avoid getting hurt again. I focused on school and that's all, I never really had any intimate friend and was not very close to my family either. To make the story short I am still dealing with insecuries and self esteem issues. I know the past is the past and I need to move on but I also know I have to face the demons of my past. Any good advice?