What does my boyfriend mean when he says to me, "Never forget each other, never pay each other, never leave each other, never remember each other"?

Literally, it's hard to say not to forget each other, and it's hard to remember not to turn around and leave. The implication is that only when I let you go can I understand what my feelings for you are, whether I love you or not, and whether you love me or not. Maybe only when I leave you can you remember my kindness to you, or I can remember your kindness to me.