LeAnn Rimes’ husband Dean Sheremet is standing by his woman.

As the new issue of Us Weekly reports that she cheated on him with her TV movie costar Eddie Cibrian, he Twittered a message of support Wednesday.

“I Love My Wife!!!” he wrote.

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On Wednesday morning, Rimes, 26, admitted on her Web site that she and Sheremet were going through “a difficult…