Just be very glad there are no children involved.
Anger is a valid emotion. Be angry. That's ok. I find Yoga helps center me and makes me happier. It is VERY hard letting go. VERY HARD. You keep thinking they were the same sober person you once fell in love with, but they aren't. They are an addict. And being sober and rational it is soooooo hard to understand that an addict will give up anything and everything for the drug. I have read over and over what an addict is, but still will never really understand it.
Im having a hard time letting go in my own relationship. But, it is time. Babysteps. Maybe tomorrow block her number. And seriously just thank your lucky stars you didn't have kids. This woman can't love right now. Detach.
Hang in there. It isn't easy. And be angry. Acknowledge your feelings leads to healing and happiness.