Blake Lively -- 3 Years of Protection from Metaphysically-Obsessed Fan

Blake Lively just got 3 more years protection from an obsessed fan, who allegedly claimed he had a "metaphysical" connection with the actress -- because a judge extended Blake's restraining order today.

TMZ broke the story ... Blake obtained a temporary restraining order against Sergei Mifle last month -- claiming the guy made repeated contact with Blake's mom, begging to help Blake because she was troubled.

According to Blake, Sergei was spotted lurking around the set of "Gossip Girl" -- insisting he was there to help Blake "heal."