Vindictive

Her vindictive behavior towards her ex-boyfriend caused him a lot of trouble.

The coach's vindictive attitude towards the player resulted in him being benched.

The vindictive neighbor called the police on him for a minor infraction.

The vindictive driver cut off another car in traffic after they honked at him.

The vindictive roommate purposely hid the other roommate's keys to get back at them for not cleaning up.