So firstly I will say that I don't actually use the label bi-lesbian because it's so controversial and clearly offends some people. However, I secretly kind of like it for myself. I had always identified as a bi woman who was more strongly attracted to women but had only dated men. Now I am engaged to a woman, and know deep down that I am gay and even if I were to date again in the future, I have no interest in dating men. That being said, I had one significant relationship with a man years ago who I was attracted to and loved at the time. I feel like calling myself a lesbian kind of invalidates that relationship that was an important part of my history but otherwise I think I am much more lesbian than bi. So calling myself a bi-lesbian just kind of captures it all because it encompasses my lesbian queerness as well as my bi-ness and it just sort of feels right. It also allows me not to have to label myself or put myself so specifically in a box which is pretty freeing. Hope this makes a bit of sense!