Just had the tile re-done in a shower - tile guy conveniently broke the screw that the shower spigot goes into-- the screw broke and it doesn't appear to be rusted
The metals clean where the break occurred. 1. how can this happen.
2. about how much of a repair is this. 3. has anyone seen this before?
Any help would be nice - Thanks

Tell us what you mean by "spigot". Do you mean the shower head, the tub spout (assuming that this is a tub and shower) or the valve where you turn the water on and off. If possible show picture.

Tile guys problem, tell him to fix what he did or he should call a plumber. Do not pay him until it is fixed correctly