Not to get too far into the semantical weeds here, but it’s imperative to understand that my usage of Everything doesn’t equate that quality with a specific person. Everything is the ultimate romantic relationship, True Love. While surely you enjoy Everything with a specific person, that person in and of themselves is not your Everything.
Sure, love songs sometimes equate one’s love with one’s Everything, and we’ll allow that creative license, but the fact is that Everything is a dynamic that you and your partner create by fully opening your hearts and growing in Love. Considering your partner to be your everything means that without that person in your life you have (or, worse, are) nothing.
You and your partner enjoy an Everything relationship. Everything is a state. A destination and a journey of the most amazing kind, free of need, free of expectation.