Not dating, but my best friend of many decades came to live with me, while he got back on his feet. He had always liked alcohol, but when he arrived, and for his stay of a few weeks to a month, his daily intake was a fifth. Found a place for him to move to, and got on with my life. We were never as close again, but we did maintain a somewhat strained friendship. Alcohol, like any addiction, is something people can fall into, and with somewhat rarer frequency, climb out of.