Audrina Patridge and Ryan Cabrera: Split or Just Spatting?

Audrina Patridge and Ryan Cabrera: Split or Just Spatting?
Audrina Patridge and Ryan Cabrera
Denise Truscello/WireImage; Nick Sadler/Startraks

04/07/2010 AT 09:15 AM EDT

Are Audrina Patridge and beau Ryan Cabrera headed for a break-up, as some online reports have suggested? A recent Las Vegas trip sure points to trouble in paradise.

Last Saturday the two flew to Sin City together where the Hills star was scheduled to host a pool party at MGM Grand's West Republic. Cut to the actual bash – and Cabrera was nowhere to be seen. Patridge wasn't too chatty either, avoiding the media and barely posing for photos at the event.

That night Patridge, 24, dined at Craftsteak with a group of friends. Again she was without Cabrera, who spent his night partying at The Bank and at Pure Nightclub.

"He seemed bitter," an onlooker, who saw Cabrera, 27, that night told PEOPLE.

First linked in January, the two have had a bit of a bumpy road – spatting in public and at various events around Los Angeles in recent weeks.

At the March 17 opening of Drai's Hollywood inside the W Hotel, the couple appeared to be having a serious talk, and an onlooker said that the reality star looked "visibly upset, and Ryan looked like he was trying to calm her down." He ended up walking away, and they spent the rest of the evening separately. And a week later at Voyeur, an L.A. lounge, Patridge seemed to have eyes for another guy: Her ex Justin Bobby, who was getting friendly with Lindsay Lohan.

So have Patridge and Cabrera broken up for good this time? A source told E! Online, "Ryan and Audrina are definitely not together right now," adding, "It's still a touchy subject for her."

Reps for the Hills starlet had no comment.

• Reporting by MARK GRAY

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