What is the ruling on a wife saying to her husband, “You are my soul; I cannot live without you”?
Question

                Is it permissible for me to call my husband “roohi (lit. my soul – a term of endearment)”, and to say to him, “I cannot live without you”? Please note that I say it out of love only.
Praise be to Allah.
    There is nothing wrong with a wife’s calling her husband “my 
    soul” or telling him “I cannot live without you”, in sha Allah; this comes 
    under the heading of kind treatment between spouses. 

    If a woman says that to her husband, she does not mean it 
    literally; rather what she means is to express her respect and love for her 
    husband, just as the soul is of great importance to the body. 

    The same applies to her saying “I cannot live without you”; 
    what she means is: I would feel so lonely if I lived without you. 

    Such words are spoken without intending the apparent literal 
    meaning. This is something that is well known in the speech of the Arabs, 
    such as when they say, “May my father and mother be sacrificed for you,” 
    “May your hands be rubbed with dust,” and so on. 

    An-Nawawi (may Allah have mercy on him) said: The words (of 
    the Prophet (blessings and peace of Allah be upon him)), “Shoot, may my 
    father and mother be sacrificed for you!” indicate that it is permissible to 
    use this expression. This was the view of the majority of scholars. However, 
    ‘Umar ibn al-Khattaab and Hasan al-Basri (may Allah be pleased with them 
    both) disliked it, and some of the scholars regarded it as makrooh for a 
    Muslim to say this. 

    The correct view is that it is permissible in all cases, 
    because it does not really mean sacrificing them; rather it is a figure of 
    speech and expression of love for him and acknowledgement of his status.

    End quote from Sharh Muslim by an-Nawawi. 

    And Allah knows best.