Roselle’s embattled police chief is threatening to sue the borough, eight months after he was relieved of duty amid accusations he made graphic homophobic remarks to his officers. In a legal filing Tuesday, Police Chief Stacey Williams claimed he was the victim of retaliation by Roselle’s mayor and other township officials, charging they targeted him because he rebuffed their attempts to interfere in the police department. “I am exhausted,” Williams wrote in the intent-to-sue notice. “After all my years of dedicated service, I am being treated like a pariah and a criminal.” In March, the borou…