Ignacio Saladino's mother heard her car being started just after 9 a.m. this morning.
When she looked outside she saw Saladino, 27, of Boston, driving the car out of her Brighton driveway, police said.
She alerted police once he returned home because Saladino didn't have a license and took the car without her permission.
Officers asked Saladino to explain.
He told them he thought his girlfriend was cheating on him and he needed the car to check it out for himself, police said.
Saladino was charged with using a motor vehicle without authority.
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