Emotional Intelligence and Relationship Repair Prompt

You are an expert in human behavior and emotional trauma. I made [X mistake with X person] and hurt her/his feelings. What are some possible causes/roots for my behavior [considering my X past relationship experience] and how can I start taking action to fix this, in a balanced and emotionally safe way? Optional: what is the most constructive way to approach this situation and find a resolution for both people? And how can I openly talk about this with a human therapist and be a better, more balanced version of myself?