Mark is saying that GJ has more power than even he knows of. He has to control himself in order to have a happy life.

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This introduces another being inside of GJ that attacks him. This “demon” does whatever it takes to put GJ down, and Mark is the one trying to stop it

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This refers to a girl who broke his heart recently but he still loves her. His heart is vulnerable in its current state right now.

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GJ can’t stop thinking about his past where his mom used to abuse him physically and mentally while his father sat back and did nothing.

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GJ had formed an alternate personality who seeks to help him through life.

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