This declaration of love uses a simile to compare emotional state to that of an olive without oil, conveying the idea that the speaker feels incomplete and lacking without the presence of the person they are addressing. Olive oil is often used to enhance the flavor and texture of food, and in this context, the comparison suggests that the speaker views the person they love as an essential ingredient that adds richness and vitality to their life. By stating that their soul is as dry as an olive without oil, the speaker is expressing the depth of their feelings and emphasizing just how important the other person is to them.