Guy long story but i need some help?

ok theirs this guy that i was friends with at the beginning of the year and then i went out with him and then i broke up with him and he was like obsessed with me so after a year i gave him another chance and then he stoped callin me and i got mad and broke up with him so i looked at myspace and saw that the guy was leavin comments on some peoples pages sayin he made me break up with me he just didnt call me and he said i was boring and a slut and now a lot of ppl hate him cause of that including me and hes sad and he still is obsessed with me and now he keeps sittin by me and tlkin 2 me what do i do should i forgive him or no cause he really made me mad and hes just creepy hes so in love with me or whatever help plz