I dated someone under those conditions in 1979-1980, Pat had divorced her husband because of his neglect. We dated for 6 months, then we lived together. I fell in love with her but she didn't fall in love with me. She went back to her ex because she felt guilty about what she had done.
Reuniting with her ex-husband did not work for the same reasons that it didn't work the first time, so she divorced him again. Five years later Pat came to visit me while I was in law school. She was en route back to New York to be near her mother. She spent the night with me. The next morning, I asked her to stay with me but she wanted to go back to New York. Two years later, I received a letter from Pat telling me that she had gotten married again, was pregnant with her first child, and she finally had the happiness she had always wanted.
In 2003, I separated from my wife and filed for divorce. I started trying to find Pat. I remembered her mother's name and the town where she lived, so I got an address for her mom and sent a letter to Pat at that address.
Pat's mom had died several years before 2003 and the people at the address I used were not related. However, the postman remembered that Pat's mom had a sister who lived in the next town and he delivered the letter to Pat's aunt, who eventually delivered the letter to Pat.
A few months after writing the letter, I received a phone call from Pat. It had been 18 years since we had last spoken. We soon were emailing every day and talking on the phone a few times per week. Pat was also in the process of a divorce, she had two children, and the three of them were living by themselves in a big house in upstate New York. We decided that I would visit Pat at Thanksgiving so I got on a plane and went to see her.
Pat needed someone to make her feel loved and I was the man who could do that. I visited again at Christmas and she visited me in Florida during Spring Break. Pat moved to Florida that summer and we were married in January, 2005. I bought a nice house for Pat, her 2 kids, and me to live in and everything was great.
I got laid off from my job late in 2006. A few weeks later, Pat announced that if I didn't have a job to support her, there was no reason for her to stay married to me. I also learned that she had cheated on me. . . with another woman.
Would I do this again? Probably not, because I am older and wiser than I was when I did all of these things. Experience is a horribly effective teacher.