Serious help

Ok so I met this guy on FB about two years ago we became friends we would talk later on he supposedly said he had “feelings” I’ve never met this guy mind y’all he never told me he was incarcerated right since all his pics are from when he was out. Now I have moved on found a man an doing my life so this guy who is in prison has threat me FROM PRISON that he will have someone look for me and hurt me and my kids now I wanna be petty an call the prison an tell them how he has a cellphone and a Facebook that way he will leave me alone. Will that be stupid of me I wanna do it anonymously but I’m scared.