It is a way of showing affection. It is not worship which is intended for God alone.
Otherwise if you ever had a lover, and called them your life, your sweetness or your hope, you would be idolizing them, making them your God.
I have called my wife my life, and I don’t mean to replace God with her.
Christ is properly the life, and our life, but others also mean so much to us that they are like our whole life, and that is the sentiment expressed in the salve regina prayer, which originates in an expressive Latin culture, vita, dulcedo, et spes nostra!