Why do you think early human liked to live in natural caves ??????
We don't really know that they did. It seems to be somethat that has just been assumed, like other sweeping assumptions about prehistoric life. it is more likely that they did build themselves shelters, just like surviving hunter-gatherer societies do in the present time.
I don't know of any present-day hunter-gatherer societies that live in caves, and it seems unlikely that our remote ancestors would have considered them suitable dwelling-places. They certainly used them for ritual purposes, as with the cave paintings that have been found, but living in them is a different matter altogether.