Why you aren't here for me every time I need you?! If you're

Why you aren't here for me every time I need you?!
If you're not here to have my back in my difficult times ,then why do you're here im my good ones.
I need someone to support me,to have my back,to be with me whenever I need someone to talk with,,,,but not one that think only of himself.
I need someone that think the best for US and not only the best for HIM...