The phrase "you are everything to me" emphasizes that the person holds an all-encompassing and central role in the speaker's world. It signifies that their love, presence, and companionship are essential and irreplaceable.
The phrase "just in case you were wondering" adds a touch of reassurance and vulnerability, as if the speaker is addressing any doubts or questions the person may have about their importance. It underscores the need to convey the depth of their emotions and affection.
In essence, this statement beautifully captures the idea of an all-encompassing and unwavering love. It reflects the belief that the person is not just a part of the speaker's life but the very essence of it, underscoring their immense value and significance.