Obsessive and Jealous friend ?

HI, I have a neighbor who has a crush on me..Im married and have children and my neighbor wont leave me alone..He stalks me, monitors where and I go..whose with me..calls/texts and emails me constantly and confessed that he is in love with me and "will have me no matter what" Im scared to death..He got mad at me the other night because I was going out to a friends house..He wanted to spend time with me and was mad because I had other plans..he then came down to my house and told me I had to take him to the hospital because he had overdosed on pills..I got upset and he then threatened to take the whole bottle..I took him to the hospital and they kept him in there for a evaluation but hes still calling and texting..saying weird stuff like we were meant to be together and when I try and tell him that Im only his friend and that Im happily married he twists what ever I say into what he wants to hear.. Im scared, I dont know how to deal with this person anymore.. and Im to the point where I may have to call the police to get him to stop..Im also scared that he will comitt suicide and then it will make me feel like it was my fault..what do I do??