This one is somewhat less likely than our other theories.
But,
Danny's parents are both gone. Danny's dad left or died when he was young so he suffered issues from that, and (this is based off fanfiction btw) his mother abused him then got up and left??So because of this, Danny suffers from abandonment issues, and this is why he couldn't keep a stable relationship. Because he was afraid if he didn't end things then they'd leave him and that scared him. This is why he acted different when he saw sandy, because he realized his friends were there and they mean the world to him so he acted different as to avoid losing them.
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This is a theory my friend and I made up earlier today and I can't remember it very clearly.
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Conspiracy Theories - Grease
RandomJust a collection of some of mine and my friends' conspiracy theories about grease. Not all will be accurate and some will be about fan fiction. Also not all are mine.