Why was I abandoned

Im in therapy. I'm taking medication. I'm doing better and I never hurt anyone and I apologized and took responsibility for my actions when I was ill. I've tried to communicate and talk things through but it's pointless. I was completely abandoned apparently without remorse. I want to have empathy for the person who left me but I'm struggling to understand. For people with close friends and family, did you choose to walk away before it got worse? Please help me to understand.