The Notting Hill star split from actress Miller earlier this month and has been spotted out in London on a string of lonely boozing sessions.
On Thursday, Ifans had to be calmed down by police after he lashed out at paparazzi after drinking until late at a London nightspot – reportedly trying to hit one snapper with a bottle.
And friends of the star are concerned about his current fragile state, with one source telling Britain’s Daily Mail newspaper that the actor is “inconsolable”.
The source says, “His life was anarchic already, but now he is going on all these hard-core benders and is inconsolable. He is going to the pub first thing in the morning.”
“He is desperate to get her 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.”