Livelsberger switched the discussion to tell Arritt what he was planning, but never gave any hint of the explosive plan.

“In my new position, I build drones,” he said. “You would like it.”

Arritt described Livelsberger as the “nicest man” she ever knew and said he once bought his ailing mother a new home.

The 37-year-old Army soldier’s wife separated from him on Dec. 26 after finding out he was cheating on her, sources told The Post on Thursday.

Livelsberger left the couple’s Colorado Springs home after an argument after Christmas in which his wife reportedly told him she knew he had cheated, the sources said.

After leaving the house, Livelsberger used the Turo app to rent the Cybertruck before driving to Las Vegas.

He parked the explosives-filled vehicle in the Trump Hotel valet, where he fatally shot himself in the head.

Livelsberger was the only person killed in the incident and his body was burned beyond recognition. Authorities identified him based on his passport and army ID card found in the truck.

Seven people were slightly injured by the explosion.

Inside the truck, investigators discovered fireworks-like mortars, camping fuel and canisters.

The FBI was investigating whether the bombing was politically motivated because it occurred outside a hotel owned by President-elect Donald Trump and in a vehicle owned by Trump’s close ally Elon Musk.

Arritt asked why Livelsberger would do that since she knew him to be a conservative, the Denver Gazette reported.

Officials are also investigating whether the active-duty Special Forces soldier known as a “Rambo-type patriot” and staunch Trump supporter intentionally selected a Cybertruck to limit civilian casualties, a source told The Post.