Hey, your relationship might be in trouble if . . . one of you uses some hardcore construction equipment to get the last word in an argument.

That’s what happened with Hunter Mills (20) and his girlfriend in Crestview, Florida.

They met up near a construction company to have a “serious discussion,” but the discussion got real hot, real fast, and ended when Hunter’s unidentified girlfriend refused to answer one of his questions.

So dude gets super extra and uses a front-end loader to dump a load of dirt on his girlfriend’s car.

Her windows were OPEN!!

(Here’s the photo)

No one was hurt, but the car did suffer about $8,000 worth of damage.

Hunter was arrested for felony criminal mischief.