The End (SPOILERS)
I don't think it was a shock when he finds her dead, but I don't think it was supposed to be. I mean considering what she says in bed, it seemed like that was what was going to happen. I really don't think this is a suspense film.
So why do you think he says to the landlord that he killed her:
He feels guilty for killing the girl
He feels guilty for Eva killing herself, and him not seeing the signs or being able to stop her
In a twisted way he wants to complete her work of art, or wants her to know he gets it
He feels like he has lost everything so he doesn't care
He is just *beep* crazy
Other