Ultimately, "Simple Love" is a "deep" track because it refuses to provide a happy resolution. It leaves the listener in the "moonlight" of a cold morning, reflecting on the fact that , no matter how much we wish it to be.
The lyrical core of the song revolves around a central betrayal of expectation: This refrain acts as a bitter callback to the beginning of a relationship where love was presented as an easy, uncomplicated truth. Feehily’s delivery of these lines suggests a profound disillusionment; the "simplicity" promised by a partner has turned into a "mess up in [his] mind" and a sense of being "lost" and "far behind".
: Unlike the arena-filling choruses of his boyband days, "Simple Love" utilizes a more intimate, internal vocal style. He isn't just singing to an audience; he is interrogating himself.