On a very basic level, memory, and reminders, can be a survival tactic, something that has helped us as a species from the very earliest days. Once we are hurt, we can be extra alert to anything that reminds us of what once hurt us.
Have you ever come across someone who reminded you of your abuser?
In what way did they remind you? Was it physical, or something else?
How do you react when you see someone who reminds you of your abuser?