now what should i do??

does he truly love me??
1 year ago we were in a good relationship but before 4 months from now we are not talking and he sometimes behaves like a stranger and sometimes like a close friend and when we were not together someone was in both of our lives but now there is no one. he does not care for me now and says he wants to be just friends but why does he behaves like a jealous when i said to him not to interfere between me and a male friend of mine. now i want to know does he really love me or not??