I had a friend who did the " I like attached guys because I get the perks and no drama." When she needed someone the all went ghost on her. She had self esteem issues too.
A lot of women don't know how to be content with themselves and feel like they need to be with someone. So they settle and are willing to buy a dream. I have also seen some get a kick feeling like they are better then the wife and they are wanted over someone else. Its competition . I never understood it and I rarely see it work out in their favor.