What have I done wrong to deserve this treatment from you?

Time passes and it's 2017. Many days, weeks, months and years passes without feeling any different. Well, it's just another day. My life have been a mixture of happiness and sadness. I always wonder, what have I done wrong to deserve this treatment from you. Whatever you are happy, it's a normal living for me, but whenever your mood swing, I suffer. Why, I also don't know!! I don't what's went wrong and suddenly I have treated like this. Tears just flow uncontrollably and heart deeply pain as I also don't know what have I done to deserve this. My life depending on your mood,my tears depends on your mood, so Who am I???