So glad I learned how to turn this off. Spiritually its a form of mental bondage. Lot's wife turned into a pillar of salt for this and that's what you are when you become a slave to nostalgia. Renew your mind daily. All you ever have is the present. Be where your feet are.
Nobody tells you how hard it is to rewire your brain so you can allow amazing things to happen to you after so much trauma or hurt. Blessings exist, good people exist, a softer life exists. Let it happen.