trying to decide whether to bring up something from years ago or just leave it alone

honestly i have been going back and forth on this for weeks. there is an old disagreement i had with someone and it still sits in the back of my mind every now and then. i keep wondering if saying something now would actually help or if it would just stir things up for no reason. at the same time i feel kind of numb about the whole situation so maybe that is a sign to let it go. i am not looking for a big confrontation or anything dramatic, just trying to figure out if clearing the air would feel lighter or if it would make things weird. has anyone else struggled with deciding when to speak up about the past versus moving on quietly?