[Akuma]

First of all find out where the guy lives. Kidnap and muder him. Start by cutting off his arms and legs. Make sure you have a plastic sheet on the ground so can collect the blood. Cut off his head at the neck. Carve out his eyes and peel the skin off his face. Now go to your ex's house and go into her room while she is asleep. Nail each of his arms and legs to each corner of her room. Hang the torso on her door. Place the skinned head on her pillow next to her head. Put the skin you took off the head onto her face carefully. If it looks like she will wake up or is facing the wrong direction just put the skin somewhere that she will see it immediatly. With the left over blood write "You're next" repeatedly on her walls.

Problem solved.