At some point the answer is “because that’s what reality is.”

If by "reality" you mean "the universe", then the way the universe is depends on a cause, as the existence of the universe is not explained by the universe itself (even an "eternal" universe). Its existence is contingent on some other cause that ultimately cannot be contingent and thus does not require explanation.

So the cause or dare I say reason for the universe being the way it is will depend on its cause.