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The actor has been spotted drowning his sorrows alone on a number of occasions since being dumped by Miller earlier this month.
He was reprimanded by police on Thursday after reportedly throwing a bottle at paparazzi.
A source told the Daily Mail: "His life was anarchic already, but now he is going on all these hardcore benders and is inconsolable.
"He is going to the pub first thing in the morning. He is desperate to get [Sienna] back and has been doing things to remind her how in love they are, such as bombarding her with their favourite Ella Fitzgerald and Edith Piaf CDs."
> Rhys Ifans: 'I'm over Miller'
