A Ventura man was arrested Friday on suspicion of robbing a variety store on the city's west side.An employee told police he followed a man suspected of stealing items from the Puerto Vallarta Ropa store at 698 N. Ventura Ave., but retreated after the man suggested he was carrying a weapon in his waistband.The employee then reported the incident police, who said they made an arrest about 1:30 p.m.