2much sorry about him leaving, just keep in mind that in order to stay sober it is far easier to do if you are staying sober for your self and not someone else.
The time now is to stay sober and focus on your recovery.
Take it one day at a time reminding your self that a drink will never make things better in the long run.
I would also suggest checking out different recovery programs, sobriety is better maintained with support and a program of some sort for most folks. WHy do it alone when you don't have to?