Question

When someone no longer lives in a house, what have they done?

Answer 1

They May Have Got Kicked Out Moved Or Sold Their House. Hoped I Helped :D

Answer 2

It depends on the situation...were they kicked out or did they willingly move out?
If they are kicked out then they are then homeless, but if they willingly moved out and moved into another place, they just simply moved. 
Not sure if that is the answer you were looking for, but that's all I can give you unless you provide more details to your question. Hope it helped! :)