Crazy and childish making behavior

Has anyone been driven by their N because they were so hurt and pissed off that they did childish and destructive things?

At the time if felt oh so good. Like putting a scratch in their truck door, stealing their beer mug from the bar, sending the new GF a note which read:

I don't want to see you get hurt again.
Beware of___________.
He is not what he appears.
Contact his ex's. They will prepare you for what comes next.
It's inevitable.
If he seems to good to be true, then he is.
(unsigned but she knew who it was from)

Then being blamed for other things that I did not do. Having his boss, who really liked me now turn his back to me when he sees me out. Having the new GF leave me a VM message saying I'm not a lady, I'm not a professional, I need to grow up and that the N did nothing wrong. That I punched him for no reason. She was going to get a restraining order on me. (Could never happen. I've never met her and she can't say that she fears for her life. It's been a month since the VM and nothing happened.) I'm quite sure he put his spin on the stories he told her about me.

Part of me feels a little guilty and embarrassed. Part of me wants to mail the beer mug back to him. And part of me says who really gives a crap. They could all die tomorrow and it would have no effect on my life. My 3 closest friends say forget about it and look forward to another new day. But I do feel he made me react in crazy behavior. The longer the time goes by I feel a little better every day. Has anyone else been driven to so things that if you stepped back and took a look at yourself you would be horrified?