LeAnn Rimes Worries Eddie Cibrian Will Cheat?

LeAnn Rimes has admitted herself into a 30-day inpatient treatment facility for anxiety.
"She is simply there to learn and develop coping mechanisms," her rep said in a Aug. 30 statement.

Now according to Us magazine, Rimes' obsession with husband Eddie Cibrian's wandering eye is a major issue is .

"LeAnn has had major insecurity issues since she first got together with Eddie," explains a friend of the couple to Us Weekly. "She's been stressed about always being called a home-wrecker and also worried that Eddie is cheating on her. She's been on a downward spiral."

"I totally support LeAnn's decision to enter rehab -- my top priority is my children, and at the end of the day we are a family," Cibrian's ex wife Real Housewives of Beverly Hills star Brandi Glanville, said in an exclusive statement to Us. "LeAnn is their stepmom, and they love her. I am wishing her all the best and I hope she will find what she is looking for while in rehab."