guys, can you explain this girls behavior . me and her are in a group of 10 at university. we have teaching sessions together. she speaks to everyone but completely ignores me. even when I held the door open for her she didn't say thanks. however when I am not looking she will look at me, she does it VERY discretely. she will always make conversations with whoever I am talking to and take over. she even started acted a bit flirty with someone I was chatting too right in front of me. is she just being a bitch, or is she into me but playing hard to get?