If you have abandonment issues or anything like that, you probably need therapy / counselling to work through them. There's only so much you can do with self-help. A professional can teach you coping techniques for the present, and acceptance techniques for the past.
To some extent, abandonment issues can never be completely cured. Gralson was adopted, so his first experience in life was being abandoned. So fear of abandonment is not something he'll ever completely eliminate. However, you can learn not to allow your fears to dominate your behaviour. You can do things, even though they scare you, and gradually learn by observation that your fears are just fears, not predictions.
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker