Overcome your fears in relationships

Change your perspective of the cause of your fears.
For example, instead of saying that your father abandoned you, see it as him leaving to make himself better.

Get help for jealousy.
This will help you stay open and centered without blame or withdrawal in the mindset of rejection.

Handle disappointments well.
Communicate disappointments to your friends and family so they can stand by you. Also, accept disappointing situations and move on with grace. If disappointment is not well handled, it can result in despair and the illusion that there is no alternative.