broken pulley stuck bearing

a pulley fell off od my engine today and the bearing is stuck this pulley is the one on the supercharger belt closest to the tentioner pulley the diagram says it is an idler pulley im not sure if it connects to anything inside the engine but i tried to take it off and it started pissing out antifreeze out of the bottom bolt hole so my questions are is this thing connected inside the engine? and where am i gunna get a new one?

Nevermind I Figured It Out

I thought i ahd this one figured out but i guess not... i got a new pulley and put it on and this one locked up the belt got shreadded and the new pulley and the tentioner pulley got Fed up so i guess now my question is what would cause this pulley to lock up?