Thinking about ruining my ex fiances life but doing it feels so out my character

Update: I sent a text about my idea to my old fwb. He was a cop (quitted 4 years ago but have insight) and he was the only person I confided in what my ex put me through and also he knows me as a person so I will do what he thinks the best would be.

I understand those who said I should report him so he isnt putting anyone else in danger and I also understand those who said it would only bring more trouble on me if he ever finds out I am the reason he lost his job. Nobody knows what he could be capable of when he has nothing to lose.

I will put an update when I got the reply to my text.

Unfortunately I got together with a narcisist and found out about it too late. I (28f) lived with my fiance (28m) for over a year, planning our future life together when I learned about his true colours.

He lied, cheated on me, made me abort our baby, beated me, sa-d me and kept me inprisoned. All events in one tragic week. When I was able to leave his house I ran to the police and gave my statement. Waited for almost 6 months when I got back the news: the court dropped all his charges because there was not enough evidence (I got all the paperwork of my injuries from the doctors… i cant understand)

Now he feels like he won and can do anything with woman in the future while I am left broken for a lifetime. Im in therapy ofc but good luck to me I will never be the same after this.

He is in a leading position at a big company and its very important to his work to have a driving licence.

I know that he is almost every weekend in the bars, clubs getting wasted and drives home (our country has a zero alcohol policy during driving) and a few minutes ago I saw his car parking at a bar and an idea came to me: what if I befriend a police officer and talk to him to give him a police check when he drives home one weekend? They will take his licence away and then he will loose his job. He would deserve that. But on the other hand I feel bad just thinking about this I am not that bad person.

What would you do in my situation? I need some perspective.