Jessica Alba dumped boyfriend Cash Warren because he couldn’t get a grip on his jealousy – and she did it over the phone!

When Jessica worked with good-looking male actors “it drove Cash nuts,” a source close to the couple told The ENQUIRER.

“Friends told him to get a hold of himself, but he was always accusing her of flirting with other guys. “She just got sick of it.”

Jessica, 26, who recently appeared in Fantastic Four: Rise of the Silver Surfer, decided to end the three-year romance while she was out of town – so she broke the news to him by phone.

She then had her assistant go see him in person to make sure he moved his things out of the house they shared, says the source. “Jessica didn’t deserve his crazy jealousy, but breaking up over the phone? Talk about cold!”

How did Cash react? Pick up this week’s ENQUIRER for details!