I understand your resentment. Believe me, I get it.
However, I use the knowledge I learned from being treated like trash to not be treated like trash again today or in the future. When I experience similar feelings to what I felt with the A, I get away from the cause of those feelings. It forces ME to look at myself and others around me to ascertain what I am feeling and why. Deep stuff. If I do this immediately, then I nip the chaos in the bud so to speak. Remove the unhealthy thing...
I also know now that being involved with A's is damaging to my life, so no more involvement with A's. Period. Not my problem.