I think very few people have the ability to truly say, "Aw shucks, it's nothing, forget about it.", and then, truly forget about it.
From my experience, nearly every experience of this type, has to be run through the gristmill of the mind and be ground up, sorted out, and hopefully, eventually, tossed to the wind. I do believe its a natural process, much like grieving over the loss of a loved one or a broken relationship, which you didn't see coming.
Sometimes, almost like a miracle, we find some tool to help us along, in the process.
After a broken engagement, and a couple of years of chewing on it, I came across an old Willie Nelson song, called The Healing Hands of Time....About 1 1/2 minutes long. That, a hot bath and a little red wine and things just started to change in my mind.