I do smile but I don't

I do smile but I don't do that from my heart
As I know deep down I miss some part
A part which gave me that strength from within
A part which made me smile in stress
Life is not the same since you left
I am feeling so helpless and in distress
Looking at the door when I can see you back
Thinking about the memories to keep a track
Of all the good times that we have had
I am missing you so much..Feeling so sad
Please come back soon my love!