Hi. My ex was similar. There was nothing on record to back up my concerns. I told the police that he was prone to drink driving. Luckily for me, it didn’t take them long to catch him. Once his license was taken away, I stood firm and told him if he drove with the kids in the car, I wouldn’t hesitate to report him. (I say this because a ban never stopped him from driving).
It took a lot of courage for me to do it. He was furious and turned my kids against me at the time, but now that they’re older, they thank me for it.
Good luck.