Police arrested a Middletown woman after she allegedly stabbed her boyfriend early this morning with a steak knife during a “heated argument.”

Middletown police responded at 1 a.m. to 636 Layfaette Ave. and subsequently arrested Tiffany Morgan, 31, of 636 Lafayette Ave., on suspicion of aggravated assault during an argument where she accused her live-in boyfriend, Steve Corbin, 42, of having sex with another woman.

Morgan told police she became upset and did slap and push Corbin, according to the police report.

“Tiffany states that they were swinging the knives towards each other and states that during this knife swinging, that she accidentally stabbed Steve in the side,” according to the report.

Corbin, however, told police the stabbing was accidental and it happened while he was walking home on Lafayette Avenue when he passed an unknown man.

The story fell apart, police said, when Corbin could not provide a description of the alleged suspect. It was then revealed the stabbing happened at the apartment. The knife was found in the bedroom, police said.

Corbin was treated and released from Atrium Medical Center, and then arrested for an outstanding Middletown Municipal Court bench warrant for failure to comply and making false police reports. The wound, according to police, required a couple of stitches.

Middletown Municipal Court Judge Mark Wall set Morgan’s bond at $5,000 this morning. Corbin’s bond was set at $2,500. Both were in Middletown City Jail on Friday.

Morgan had been found guilty in Middletown Municipal Court on two resisting arrest charges in 1999 and 2000, but had only been found guilty on a handful of traffic-related charges, the last being in 2004.

Corbin has been found guilty over the past several years of numerous charges in Middletown Municipal Court, including sexual imposition, intoxication, domestic violence and drug-related charges.