When David Arquette made the decision to enter rehab for alcohol issues and depression, the actor didn't have to look further than his ex, Courteney Cox, to find heartfelt support.

"I really admire David and his choice to take charge and better his life," the Cougar Town star, 46, tells PEOPLE. "I love and support him."

Arquette who separated from Cox in October and is dad to their 6-year-old daughter Coco, has been having trouble managing the separation, one source told PEOPLE recently. "He's just not handling this situation well," the source said. "He's really depressed."

Arquette, 39, has not entered the rehab program for drug use, several sources say.

David Arquette is seeking treatment for alcohol and other issues -- but not drugs. Arquette partied at Beacher's Madhouse at the Roosevelt Hotel on New Year's Eve before checking into a live-in facility.

A source close to David says he is doing it because it's "the right thing to do for his family."

UPDATE: Through her rep, Courteney Cox tells TMZ, "I really admire David and his choice to take charge and better his life. I love and support him."