I am also the one who asked her to move in with me, not her. She was very hesitant about doing that. I convinced her. We were together for 9 months before she moved in. Back in May or June I was just so crazy about her. We talked about getting engaged by the end of the summer. So in her mind why protect herself if we are talking about getting engaged/married. I felt the same.
I guess this explains why she was so upset when you refused to get engaged after she got pregnant. Sigh