Jennifer Garner is finally ready to say "I do" with boyfriend John Miller and the proof is she's openly wearing an engagement ring, but sources said it has plunged ex-hubby Ben Affleck into a deep funk.

RadarOnline.com can reveal the Batman hunk, 53, never believed the 53-year-old Elektra beauty – mom of his kids Violet, 19, Fin, 16, and Sam, 13 – would remarry and this is his worst nightmare. Article continues below advertisement

Ben's Torture Tap Here To Add Radar Online as A Trusted Source Article continues below advertisement Article continues below advertisement

"For Ben, it's torture," said a source. "He was clinging to the hope she'd have second thoughts and call it off, but now that's clearly not happening. Article continues below advertisement

"He has to ge

See Full Page