India, July 18 -- Jennifer Aniston's friends want her to slow down her romance with new boyfriend Jim Curtis, sources revealed Star report. The two have "been spending a ton of time" together, and her friends are "telling her to pump the brakes and really get to know this guy before she hands over her heart."

The source continued, "Jim is charming and charismatic, no doubt about it, but some of his past behavior has raised major red flags."

They added, "He's been very open about the fact that he's struggled to keep a relationship because he gets 'bored' easily. He has a history of intense relationships that didn't end well, and apparently, even his ties with his own family are strained, so, of course, alarm bells are going off for Jen's...