I am confused. So, you are trying to get closer, wanting to "lightly pursue" asking her on a date.... then you kick her out of the MBR?
If I am getting this straight, I can see why she might be venting to someone else. You are asking her out on dates then kicking her out of the MBR the next night?
Can you see where this might make her say WTF? You need to stay consistent. She's going to have nothing nice to say about these tactics. And she is going to vent about you to someone. I am not surprised.