Avoidant attachment - fixable?

Hi, I’m with an ISFP 6w7 who has an avoidant attachment style which creates a divide between us and struggle to progress our relationship. His fears of rejection and commitment cause him to reject love and avoid commitment. However, he is acutely aware of this and says he wants to get professional help to fix his attachment style. So I’m here asking… Has anyone had personal experience healing their avoidant attachment (trauma?) Has anyone been with someone who has healed their avoidant attachment (trauma?) Can an avoidant ever actually commit? (edited)