Review of Passion

I found it very good, but the ending very puzzling. I felt "I tought I was an intelligent person, but it seems I am not enough to understand this"...

I d'ID not get the bit about the twin and then waking from yet an OTHER dream, while the lesbian lover was still lying dead on the floor...

I searched for an explaination, here, but did not find any. Am I dumb? I did'nt get the last bit.....