A Montana woman armed with a machete has been accused of breaking into her ex-boyfriend's home, ordering him to undress and forcing him to have sex with her.

Samantha Mears, 19, has been charged with aggravated burglary and assault with a weapon, criminal mischief, assault, and unlawful restraint stemming from the bizarre incident that took place on Friday in Great Falls.

According to a criminal complaint, Mears entered the home of her ex-boyfriend on 2nd Avenue Northwest while he was away and waited for him to return.

Lovelorn girlfriend: Samantha Mears (left and right), 19, is accused of breaking into her ex-boyfriend's home, ordering him to undress and forcing him to have sex with her at knifepoint

The victim, pictured here sharing a kiss with Mears during happier times, told police he went along with the encounter out of fear

When the man entered the residence, Mears allegedly ambushed him from behind with a machete in her hands and ordered him to take off his clothes and get on the bed, reported KFBB.

The victim later told police he complied with the woman's demands out of fear for his safety and said he did not feel he could retreat from the room without being harmed by Mears, according to the complaint.

The 19-year-old then allegedly took off her pants while still holding the large knife in her hands, straddled her ex-boyfriend and proceeded to have sex with him.

The male victim claimed Mears bit him on the arm and continued to have sex with him even after he tried to get her to stop.

Afterwards, Mears sat naked on the bed brandishing the machete, and the victim was able to take several photos of her in that state, which he later handed over to police as evidence.

Mears and the man then got into an argument, during which the nude 19-year-old woman allegedly ripped off a piece of trim from the wall and urinated on the bed.

At one point, Great Falls Tribune reported that the man was able to dial 911 after telling Mears he was calling a friend, and then back out of the room and escape.

Afterwards, Mears sat naked on the bed brandishing the machete. She allegedly urinated on the bed and ripped trim off the wall

When police arrived, Mears claimed that she had been kidnapped by her ex-boyfriend and that he had given her the machete for self-protection.

Responding officers made note that the female suspect appeared to be suffering from a mental health problem and was in a confused state.

The incident comes just days after the 19-year-old had been arrested for allegedly assaulting and strangling her ex. The pair had been together for about seven years prior to their split.

Mears was booked into the Cascade County Jail on $50,000 bond and ordered to stay away from her ex-boyfriend.