reasons for loss of interest

hi , my dob is 8th jan 1992 and i m in a relation with divya sharma whose dob is 1st march 1990 as she is elder to me but we both are in a relation from last 19months ... bt now from last 6 months i m not feeling good bcoz she is not the one as she was in begning first year . her mother read my msg and came to know abt our relation .. after that movement she behaves like a normal girl wid me , i truely love her and dont wanna lose her anytym .