I question is he doing this to make me feel bad and want to take him back. Is he that desperate?
My guess is that the behavior is not an intentional ploy to get you back. Rather, you are seeing just how bad his coping skills and self-soothing abilities are. He is numbing his thoughts with alcohol and pills rather than address the issues. He his accepting the role of victim in this drama of his rather than taking responsibility.
There is nothing that you can do to help him with this, and the call to his family to keep an eye on him was a nice gesture. This is all on him. He needs to work through his Whys?, as in why he had an A, but before he can do that he needs to sober up and take responsibility.
Continue to focus on you and your children.