Somehow i dont believe they are dating. A man who catches they girl in the act aint taking out that rage on a car when the girl and the man are right there for the taking.
If i had to guess, i'd say the woman asked the man to fix her beat up car for a fee and promised to pay him back. He installed a new engine and then she ghosted him. He hunted her down after waiting forever to get paid and then took back his engine since she was ducking paying him.
I'd also guess that the woman is likely an escort who that cac is getting services from.