Ali, there is no way for you to know if he is getting close. Recovery looks like, sounds like, and feels like recovery. You would know. I drank for decades. I had all kinds of consequences to my drinking but that didn't stop me. It's straight out of the alcoholic's playbook to blame others and try to deflect any criticisms. There are usually a lot of coexisting delusional mental health problems that are part of alcoholism. That's what happens when someone applies a toxic poison to the brain.
Please don't second-guess your decision. It was the right one. He can get his butt to an AA meeting (free) and get all the support he can possibly want.
If he contacts you I would tell him to call you after he's been sober for a year. That will give you both the time to figure out what you each need.
You cannot fix this. You'll make yourself crazy worrying about what he's doing. Let go or be dragged.