AMERICANS from coast to coast were shocked when news broke that a 22-year-old bride was accused of coldheartedly pushing her husband of just eight days off a sheer cliff.

And now, an ENQUIRER investigation can reveal the startling reason why Jordan Linn Graham allegedly snapped and sent her 25-year-old hus­band Cody Johnson hurtling to his death in Montana’s Glacier National Park.

On Oct. 3, a grand jury charged Jordan with murder in the brutal slaying of the young factory worker. And a source close to the investigation told The ENQUIRER: “One of the police theories is that the new bride ‘snapped’ after her hus­band figured out she had lied about being in love with him. She was only in love with the idea of being a bride.”

Although Cody was once wild for Jordan, the source says cops suspect that he told her he wanted a divorce or annulment. Jordan couldn’t face telling family and friends that her husband already wanted out of the week-old marriage – so she came up with a crazy plan to kill him and make it look like an accident, theorize experts. The couple had known each other for less than two years before they tied the knot June 29 in a beautiful and romantic sunset ceremony.

“Jordan was a dreamer who was more excited about the idea of marriage than actually being married,” a friend told The ENQUIRER. “She loved picking the wedding dress and showing off her ring, but on the day of the actual wedding, she sobbed uncontrollably.”

Jordan even hired a song­writer to pen a special tune for the wedding, which ironi­cally happened to contain the line: “Everyone wants a safe place to fall, and you’re mine.”

According to a police affidavit obtained by The ENQUIRER, Jordan – who worked at a day care center – admitted to pushing her hubby off the perilous cliff on July 7.

The affidavit says that the couple got into an argument while hiking on a trail, and Cody grabbed her arm. “She then turned and removed his hand from her arm…” the affidavit continues. “She said she could have just walked away, but due to her anger, she pushed Johnson with both hands in the back and as a result, he fell face-first off the cliff.”

After Cody failed to show up at work the next day, his uncle reported him missing. And Jordan apparently tried to cover up what had really happened by texting his boss to see if he’d shown up for work.

She later told authorities that she had received a text message from her husband, saying he was going for a drive with a friend from out of town.

In a final bizarre twist, Jordan reported finding her husband’s body July 11 within the boundaries of Glacier National Park.

The bride was busted and, if convicted, faces a mandatory sentence of life behind bars.