The phrase "You will never know how much I care" suggests that the speaker's feelings go beyond what can be expressed in words. It signifies a profound emotional connection.
The subsequent parts, "You are my best friend, my soulmate, and my everything," highlight the person's multifaceted role in the speaker's life. It signifies a bond that encompasses friendship, soul connection, and emotional depth.
In conclusion, this statement beautifully expresses the idea of an all-encompassing love and appreciation. It underscores the person's extraordinary significance in the speaker's life, emphasizing the depth of their affection and the desire for this cherished connection to endure indefinitely.