looking for the best advices in this kind of situation

im in a 2year relationship.... but our relationship is not stable.. we always break up,,but the last time the two of us broke up.and back together... he is not the same anymore...hes attitude has change..i dont fell his love anymore.. everytime i try to ask him if he loves me .. he saiys that he love me.. but i dont feel it... onemore problem is we always fight... what is the best thing to do? the both of us is aways fighting?