Don't feel guilty for telling his mother. Toward the end of our relationship, I told my AXBF's mother about his binges and he was really upset. He told me he didn't want her to be upset, and then he'd call her and assure her that he was fine. He actually thought she believed him, too. My telling his mom what was going on was motivated by my refusal to live in denial anymore about his addiction.
He didn't want anyone else to know what was going on. I felt like I was trapped inside a jar with a tight lid on it, with no one except me and ABBF knowing what was going on in our life and how it was falling apart. I had to tell someone.
When you get to your apartment, I hope that you will have peace and calm to collect your thoughts and take care of yourself physically. Sleep helps a lot!
My decision to leave my ex two weeks ago was for many reasons, but one big one was that I was physically exhausted. I could feel myself getting physically sick.