and then what? what should I achieve with that ?
It's quite possible that he reported you to Adsense specifically as a petty demonstration of the "power" he wields. And while your site may have been your only income, his was probably one of dozens more, so it didn't really matter to him.
Short version: you had a lot more to lose and nothing to gain compared to him.
Even if you do care about these events, sometimes it plays to your advantage to keep things off the blog.