I dont know what to do!?

ok my bofriend of 4 months broke up with me and i dont know why and we decided we were going to be friends right... well me and him just couldnt help it we always found a reason to fight over anything... then the next day we would act as if it neva happened.. a lot of drama went on...we started talking again(like as in dating) then a rumor went around that i made out with his brother(wich i totally didnt!!!) and he hated me and told me to get over him and we jus went back to being friends again for only a week... well one night we got into an argument and he said he wuz going to kill himself and i told my bff and she got mad at me... so i talked him out of it because i dont want him to die i love him.. well the next day my bff told me that she liked him... and she knew i loved him... and well to git to the point me and him r going out now.. i love him but im scared that he'll jus dump me agian but im having mixed feelings!! i love him but i dont really want to go thru that agian ya no!