Showbiz
Rex Features
The Welsh actor believes Miller may have cheated on him with Rhys while filming new movie The Edge Of Love, according to The Sun.
Ifans apparently said he would "punch his lights out" if the rumours are true.
"He’s taken the break-up really badly," said a source. "He’s spent the week in the pub texting Sienna - begging her to change her mind.
"His hurt has turned to anger and he has said he will sort Matthew out when he sees him. He’s raging."
The Notting Hill star has also allegedly told Miller that he will confront her at the movie's premiere in Edinburgh on June 19.
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