What do I do when he won't leave me alone?

So I was with my boyfriend for 4 years we have a daughter. We went though some hard times and I ended up dating our neighbor (my boyfriend moved out) I only dated him for a month but he told me he loved me constantly and was ALWAYS there. I left him and am now trying to work things out with my boyfriend. I moved out of the apartment because he constantly was coming over trying to beg me back. I live with my "kind of" boyfriend that I was with for four years. Every time I log onto facebook he IMs me or messages me love poems, love songs, etc and tells me he loves me. I deleted and blocked him, now his son just sent me a message telling me his dad loves me and why did I delete him and I am really just sick of it! We only broke up last week but damn I feel like he just will NOT leave me alone. What do I do?