Aaron Hernandez — Fiancée Called Cops After Bloody Mess at All-Night Party

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Aaron Hernandez” fiancée called cops on him just a few months ago when he punched a window in their house, and bled all over the place … our sources has learned.

Sources tell us the incident went down at their rented home in Hermosa Beach, CA … where Aaron and some buddies were partying from 4 PM to  9 AM.

We”re told when Hernandez and Shayanna Jenkins began arguing — because she wanted to pull the plug on the party — Hernandez put his fist through a window.

His hand was cut badly enough that there “was blood everywhere.”

We”re told Jenkins called police in a last ditch effort to break up the party.

Law enforcement sources tell us cops have been to the house multiple times — and that Hernandez “had no regard” for anyone who complained about his all-night parties.

The word neighbors keep using to describe him is … “nightmare.”