Girlfriend's Heartfelt Love Letters to Man on Missing Flight.
Sarah Bajc still holds hope that her 'dearest love' Philip Wood is alive.Sarah Bajc/Facebook

The girlfriend of an American passenger aboard missing Malaysia Airlines flight MH370 has said she got a death threat and numerous offensive phone calls besides having her apartment broken into twice in the aftermath of the plane tragedy.

Sarah Bajc, who had been dating passenger Philip Wood, told NBC News that she got an instant message that read, "I'm going to come and kill you next" two weeks after the airplane disappeared on 8 March.

Bajc, a 50-year-old IBM Malaysia employee, added that she received pornographic images and creepy phone calls from the same China-based number.

"It was just another straw on the camel's back, very upsetting," Bajc said.

Bajc said the phone calls and messages came shortly after her apartment was robbed for the first time.

"Whoever came wasn't very careful because I'm a real neat freak, so it was immediately apparent to me that some things had been moved," she said.

"My housekeeper was out of town so it couldn't have been her and I got home before my son got back. The password on my safe had been reset which happens when you try the wrong code three times."

"The second time was a couple weeks later and my neighbour saw two people leaving my apartment. I have no illusions of privacy here [in Beijing]," she added.

Bajc was planning to marry Wood and was getting ready to move with him from Beijing to Kuala Lumpur, the report said.