Why did Bruce wayne in the Dark Knight rises even need to fake his own death?

Couldnt he privately or publicly marry Selina kyle.
Update: @ Jay Randall. There are only 4 people or 5 if you include Harvey Dent's late girlfriend who knows the identity of Batman. Robin John Blake.Commisonar James Gordon.Lucius Fox and Alfred Pennyworth.Commisoner James Gordon is the only high ranking person in the public service who knows who Batman is.This... show more @ Jay Randall. There are only 4 people or 5 if you include Harvey Dent's late girlfriend who knows the identity of Batman. Robin John Blake.Commisonar James Gordon.Lucius Fox and Alfred Pennyworth.Commisoner James Gordon is the only high ranking person in the public service who knows who Batman is.This happened after Batman told him about he putting reassuring a boy that it is not the end of the world.But commisioner Gordon never revealed even to Robin John Blake about the identity of Batman. In fact when Robin John blake said " No one knows who really saved Gotham City".Commisioner Gordon said it was the batman.This meant he wanted to keep ot a secret for perptually
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