To heal a wound you need to stop touching it.
Some issues are best left alone to heal. Having the wisdom to discern the difference is something that only life experience brings.
I think we are all good at allowing something that is disturbing to ruminate within, causing anxiety, fear, apprehension and needless energy gets utilized in the course. A sign of maturity is when we are able to compartmentalize the intrusion into our psyche and allow those apprehensions to dissipate.
It is a fresh year, perhaps it becomes a line in the sand to put certain things behind us and focus only on the future.