Hollywood couple Jennifer Aniston and Justin Theroux's relationship is reportedly in trouble.

According to Star Magazine, the 46-year-old Friends actress was complaining about the couple's relationship to former co-star Courteney Cox, while dining at the Sunset Tower Hotel in West Hollywood.

"She kept saying that, once again, she'd managed to mess up an important relationship," an alleged source said. "She was talking very loudly. She said her fiancé wasn't trying hard enough to save the relationship and she was so tired of always fighting with him."

"Jen and Justin have been falling apart since the start of the year. They lead virtually separate lives. You rarely see them together anymore; it's always work, work, work. It was only a matter of time before things fell apart. They're just not that into each other anymore. It's a sad state," the insider added.

The We're The Millers actress and Theroux, announced their engagement in August 2012 after dating for 15 months.

"Jen is mad because Justin agreed to this schedule without talking to her about it; she feels like he's not making her a priority. They haven't seen each other for most of April and that's more time than they've spent apart since they started dating four years ago," the source went on. "Justin said she needs to be patient, but Jen thinks it's already been too long. Being no closer to a wedding date after more than two years of engagement makes her feel like a fool."

However, during an interview with Australia's TV Week magazine, the 43-year-old actor revealed that there is a lot of pressure from the public on getting married.

"There is this hum of pressure that - I can't stress enough - I just don't pay any attention to," Theroux said.

"But I am not going to let a tabloid tell me what to do. ...I'm not going to watch them tap their watch. What the hell are you telling me to do?

"We're just doing our own thing. We are completely happy, obviously, but we're not on anyone else's time frame," he added.