Don’t give out a key.
This really is just a warning not to give out a key to anybody, and I do mean anybody.
I trusted him. Why I trusted him does not stand up to reason because I had only known him a little more than a month. Most nights he stayed here. Often when I made it home from the office he would be waiting at my door for me, so I gave him a key, so he could wait inside with a coffee.
As always happens the harmony started to fade, he showed less often and when he did show it was often with several drinks inside him. Then the break up.
I asked him for the key only once. Not wanting him to think that I still held an interest I did not pursue its return. Then arriving home I discovered things missing. There was no evidence at all of somebody breaking in.
It had to have been only him. Opinion will be that I report it, but no. Which is worse, the “burglary” or the broken trust?
Lock has been changed of course. Never give out a key.