It's difficult, isn't it? There's a lot of grieving involved in moving on past an alcoholic relationship. In my case, so far I have grieved:
The XABF I used to know
The hope of a future with the XABF I used to know
The hope of a future with XABF, period
Being in a relationship with XABF
Having a relationship with the individual members of XABF's family (It was best for all if I moved on and stopped communication with them)
Sharing an apartment with XABF, and having someone there when I'm home (I adopted a pair of kittens to help with this one)
Having someone who drives me to and from work
Having someone to go eat lunch with at work (I am happier eating alone right now, because if I eat at my desk I can leave earlier)
And who knows what else, there's all the little singular things that open stuff up and then I grieve again, for that particular aspect.
The more things I have grieved, though, the less time it takes me to move on after identifying the next thing that I'm grieving, and the more joy I find in all the new happy experiences I am having in my life. But it takes time.
I'm glad you've identified it. Now you can work through this one, too.