In the fearful avoidant attachment style, a person craves love and intimacy, but once that person receives that care, love and support, he gets scared and tries to distance himself from his partner.
Though the person still loves his partner, he thinks this relationship will not work, bad things will happen, and the other person may leave him.
This starts developing fear in the heart of fearful avoidant regarding rejection and abandonment.
He also finds it difficult to express his emotion and love, and he becomes overwhelmed by intense feelings, eventually leading to conflict in relationships.
Once the fearful-avoidant distances himself from his partner, the other person starts chasing him to save the relationship.
This is known as the fearful avoidant chase.