I wish I did more damage to my ex's car
Why did you want to damage his car?
He's out of control and I think he deserves it.
Being angry at an ex is pretty normal. But damaging other people's property isn't right. It's best to move on and find someone else and be happy.
It's just a car bro, I'm sure he will buy a new one.
You're right that a car is just a piece of property, and damaging it probably feels inconsequential compared to the pain that your ex caused you.  However, the fact remains that it is unwarranted and illegal to willfully damage someone's property like this.  The best thing you can do to your ex is to just forget about him and move on.