Don't get stuck in a rut. Comfort is nice, but adventure makes life worth living. Seeing an old flame has begun to rekindle sparks. If you feel the need to go back and erase the mistakes of the past, do just that. Allow your inner voice to guide the affairs of your days and nights.
Attraction is incredibly powerful.
A new job has left you feeling secluded and alone. Turn around and go back to the old job if that is where you find your peace. Relationships started now will have little reward. Even though you say you are fine, the wear and tear is obvious in your eyes. Don't disregard your need for rest.