almost all my villagers are gone

so I built my house and farms right next to a village and it was teeming with life then all of a sudden after coming back from mining they were gone. a few days past and went about my business, i could not see anyone so i looked for anyone. i found the blacksmith and a normal villager little far out from the village just doing small movement. I manage to get them back into the village and they ran right into a house. I search the rest of the area and nothing. also my iron golm wont spawn, i build it but nothing happens. also its not enemies killing them, i play on peaceful