What does my ex want?

i dated a guy for about 4 months. And then he broke up with me. After 3 months, he started calling me again. after some time, i asked him what i am to him and he says he doesnot know. Sometimes he says we are friends but acts jealously when i am talking with other guys. we always fight and stop talking for some week but he always call back. this time, i became so fed up with his manner and apparently he also. he didnot call back even after 2 months but for the new year, he sent me a new year text. what does he want?