What do you mean by coming back around? He was transferred, doesn’t work there, you aren’t friends. Let’s try putting effort into getting help as has been suggested by many of us or at the very least try to distract yourself.

There is zero need for him to be back at all

Do you go for walks? Gym? Read? Watch some movies? Tv shows? Do house projects? Swim? Bike? Walk? Do some crafts? Cook? Redecorate? Do coloring books? Anything to stop bothering with these managers. Is there anything you might enjoy or need to get done at home? There are many ways to take your mind off things