> Getting in to the parking lot of the old office sounds way healthier than not making it out of bed at all.

Missing your ex and lying around depressed in bed is less unhealthy than getting into the car and sitting outside their house.

You've cherry-picked a situation where there is an obvious social norm being broken. A better example would be going to the park and sitting on the bench you used to sit on with your ex. I agree with GP that this is healthier than lying despondent in bed.