Livelsberger switched the discussion to tell Arritt what he had been up to but never gave any indication of the explosive plan. “I’m building drones in my new position,” he said. “You would love it.” Arritt described Livelsberger as the “kindest man” she ever knew and said he once bought his sick mother a new home. The 37-year-old Army soldier’s wife broke up with him on Dec. 26 after she discovered he was cheating on her, sources told The Post Thursday. Livelsberger shared a baby daughter with his wife when she found out he was cheating on her. Facebook / Matt Berg Livelsberger left the couple’s Colorado Springs home following a post-Christmas argument where his wife reportedly told him that she knew he had been cheating, the sources said. After leaving the home, Livelsberger used the Turo app to rent the Cybertruck before driving to Las Vegas. He parked the explosives-filled vehicle in the valet area of the Trump Hotel 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 from his passport and Army ID found inside the truck. The active Special Forces soldier, was known to be a “Rambo-type patriot” and staunch Trump supporter. Seven people sustained minor injuries from the blast. Investigators discovered fireworks-style mortars, camping fuel and canisters inside the truck. The FBI was investigating to see if the bombing was politically charged because it occurred outside a hotel owned by President-elect Donald Trump and inside a vehicle made by the company of Trump’s close ally Elon Musk.