Hollywood A-lister Tom Cruise has found himself nursing a broken heart after his Russian girlfriend, Elsina Khayrova, abruptly ended their relationship following his surprise marriage proposal. The 61-year-old actor, who was photographed in early February landing his helicopter at a London heliport with a beaming smile, had recently gone public with his romance with the 36-year-old former model at a party in London's Grosvenor Square in early December.

According to a source, Cruise had asked Khayrova to marry him and was in the midst of planning a lavish, $10 million wedding when she suddenly called it quits. "She started questioning why Tom was in such a rush to tie the knot," the source explains (via Star magazine). "It was all moving too fast. She got scared off."

The Mission: Impossible star is now reportedly desperate to win Khayrova back, sending her flowers and jewelry in an attempt to reconcile. However, the source notes that the divorced mother of two is unlikely to change her mind, stating, "It seems like for her, it's over."

Cruise, who has been through three divorces, believed he had finally found "The One" in Khayrova. The couple had met through mutual friends in London's high society circle and spent most of their time together in the U.K., where Cruise owns a six-bedroom penthouse apartment, according to In Touch. Khayrova, the daughter of a well-connected Russian politician, reportedly owns homes in London, Dubai, and Cyprus.

The Russian socialite seemed to be a perfect match for the action star, with a second source describing her as "gorgeous, has a great sense of style, loves a good party and loves adventures - like skiing and trying new restaurants. She's always down for any activity. She also takes really good care of herself and is always at Pilates."

However, Cruise's intense love and desire to move quickly ultimately led to the relationship's demise. "Tom was in love with Elsina, and when he's in love he moves fast," the first source says. "Then he did what he always does when he finds a woman he loves, he asked her to marry him."

Khayrova initially accepted the proposal but soon began having second thoughts as Cruise feverishly planned their nuptials, obsessing over every detail from her favorite flowers and colors to her wedding dress and honeymoon. The devout Scientologist also wanted a double-ring wedding, per the church's traditions.

"Tom was handling every aspect of it and it started freaking Elsina out," the source explains. When Khayrova finally told Cruise she was ending things, he was devastated. "She sat Tom down and told him she couldn't go through with it. She explained that she had gotten caught up in the moment, but she needed a break. He was shocked that she changed her mind," the source adds. "She broke his heart."

To make matters worse, a third source reveals that Khayrova may not have signed a nondisclosure agreement (NDA) when they began dating, leaving Cruise open to the possibility of her revealing intimate details about their time together. "Elsina might feel she shouldn't have to sign an NDA considering she's a very rich socialite with family and political connections," the source notes.

This has left Cruise filled with regret and in "panic mode," according to the first source, as he fears he may have opened up too quickly and shared too much with Khayrova. "He really thought he'd finally met his next wife. It's a huge loss," the source adds.

As the Hollywood icon comes to terms with yet another failed relationship, the question remains whether Elsina Khayrova will choose to keep the details of their whirlwind romance private or share them with the world. For now, Tom Cruise is left to pick up the pieces of his broken heart and move forward, while his fans and the media speculate about the reasons behind his runaway fiancée's sudden change of heart.