02/13/2012 at 03:00 PM EST
and Justin Theroux may be teaming up onscreen for the new Judd Apatow movie Wanderlust
, but it's their off-screen relationship that people are more interested in. And that's a subject on which Theroux, at least, is vowing to keep mum.
"I understand the curiosity, but other than saying I am happy, I am not going to indulge it," Theroux, 40, recently told New York
. "That's building your own torture device."
For her part, Aniston, 42, recently described herself as feeling joyful and peaceful
in the relationship.
The couple, who met on the Wanderlust
set and have been seeing each other
since last May, moved in together
about six months ago.
But while they have no plans to get married or have children anytime soon, according to Aniston
, they did recently welcome a new addition
– a 3-month-old boxer-pitbull mix named Sophie.
"She’s the most adorable little cookie you’ve ever seen," Theroux told the magazine of their black-and-white rescue puppy. "She looks like she just smoked an exploding cigar."