g- I've got to say... If I was to date a woman with a twelve year old, I would have to figure that if it became an exclusive long term relationship I would be a part of the youngster's life. Depending on the existing conditions with the real dad it might not be quite fatherly, but it would be something in that direction. I have a lot of trouble seeing how you could expect a mom to separate her life from her kid's life.
OT is right. If you don't have any interest in being at least part time parent, this isn't the woman for you.