Dreaming of former partner because you smell him hear him see him

Have you been dreaming of your former partner? You might have been triggered by some factors like stimuli of smell, sound, or sight. If you smell a certain scent that reminds you of your former partner, that might trigger a dream about him that night. During your day, if you hear a song or sound that you associated with your ex, that may trigger a dream to be played that night.