What really helped me to get 'past' my exgf, while getting/staying sober, was reading the friends & family section here. It's a real eyeopener when you read it from the otherside. My ex was also a drinker as well though,so when I got sober I left her the last time. Mine was a toxic relationship and I *think* that a lot of relationships with one/both partners caught up in active addiction tend to have some level of codependency involed. At least that's the way I see it.
Two ways to go: 1) Continue to drink at/over the breakup and stay stuck. 2) Work a good sobriety plan for yourself,not to try to get her back, and live your best life.