"Old wounds" refers to past hurts or emotional pain that someone experienced in the past, but still feels and struggles with in the present. Full definition
I am able to help individuals heal old wounds created in childhood by abuse, neglect, substance abuse and divorce. (psychologytoday.com)
So many couples use disagreements as an excuse to bring up past hurts and open old wounds. (marriage.com)
Over the long - term, however, actually taking revenge against relationship partners appears to prevent old wounds from healing. (scienceofrelationships.com)