Why does my ex still care about me drinking after breaking up? When I was drinking, he said he wanted to disappear.

Because he still has feelings for you.

After breaking up with your ex, you still manage to drink. This situation may be because your predecessor has not got rid of the emotional distress of breaking up and still has emotional attachment and interference with you. I don't want to see you drink to harm your health, so I can't help but want to control you.

You need to give him some time and space to deal with his emotions, and at the same time keep your distance to avoid further development or in-depth communication.