The song is about being completely in love and feeling overwhelmed by those romantic feelings. The singer feels weak, breathless, and swept away by their love for their partner, saying their love is what allows them to survive and that they can't imagine life without their partner's love, feeling like forever wouldn't even be long enough with their partner. Their heart beats again every time they breathe in their partner, and they feel they are drowning in and can't help but be overwhelmed by their love.