Armie Hammer’s rumored fiancée Marina Gris reportedly called off their engagement just three months after the actor proposed because she didn’t trust his intentions, RadarOnline.com has learned. According to a sensational report, insiders claim the 26-year-old IT consultant broke up with Hammer, 37 because she believed he was trying to use her to resurrect his shattered career. “Marina’s friends convinced her Armie was using their relationship as a public relations prop to show the world he was a changed man,” a source told the National Enquirer. The 37-year-old actor has been attempting to ma…