Abandonment issues

Has anyone overcome abandonment issues? I feel like my issues with my father and my fear of being left have found their way into my adult life. Therapy didn’t help much, i may not have had the best therapist. But how did you guys overcome this? I feel like I’m in spiritual and mental anguish all the time, i can’t ever just enjoy anyone romantically bc I’m so afraid they’ll leave me and i feel so unhealthy for it