Alcohol and relationships?

I met a woman almost three months ago. We hit it off nicely, But I saw things. She’s 48 years old, lives with her Mother, was getting laid off and starting to get a little unemployment and when we went out she drank all the time. About a month in the relationship she had admitted that alcohol had lost her home, other jobs and marriage. I wanted to help. We had broken up for a week almost the first month in the relationship. But, I talked to her and she came back. A month ago I talked to her that the relationship was drifting. We talked and worked it out again. I just finished my Masters in Education plus, I’m a partner in a Health Insurance company. I paid for everything She said I was had to (woo) her. I was feeling used. 90% of the time she just wanted to go to Bars. I saw her during the day during the week a few times and one weekend evening a week. I was teaching and going to school in those evenings. I figured later she hangs a lot at her favorite watering hole. This past Monday I finished my last final early for my degree. Earlier that day I saw her for lunch and tried to get her resume’ going she seemed like she didn’t want to do that. I took her to lunch and we went somewhere else for desert. I started speaking to her about her drinking. She went off and said I’m 48 years old, I know what I’m doing you don’t have to tell me anything! Don’t preach too me!!! I also spoke that now I’m done with school I can see her more in the evenings and she doesn’t have to be at that bar your always at. She didn’t say anything. When I dropped her off after lunch she said I’m going to nap and go to the store for my Mom. When I got out of my test I wanted to celebrate. I called her and asked are you ready to celebrate! Are you at home she replied “I’m somewhere you don’t want me to be” meaning the bar. She said come down and we’ll party. I said I don’t want to cut into your friend time. Next, Day I called her she out of the blue. I don’t want to see you anymore, I can’t see a future with you and your to intense. 24 hours before it was the total opposite she was going to live with me and everything. She said I’m a good man and treated her like a Queen and was very sweet to her. It was her she said. I feel she picked Alcohol over me.. People I’ve spoke with including a friend who is a Clinical Social Worker said in her 20 years people with addictive personalities tend to try to come back 80 to 85% of the time is that true and Why?
Thanks