Have you ever just felt in your soul?

That someone was gay, but they claim to be straight, and it kills you everytime they say something straight, or bring up a boyfriend, or have a boyfriend in my case...I mean she fluirts with me all the time, and she HAS to know she is cause for me its so blatant and obvious, And sometimes I think when I look at her she knows that I like her, so I get like self-concious and its weird i know, but god I just know she's into girls, or maybe just me, sorry I don;t want to sound conceited but I just feel in my soul that she is gay and I don't understand how she has a boyfriend?? Will someone explain this to me please? I seriously just admitted to myself I liked her and all these emotions are flooding my brain and it sucks..and I know you all will probably say, "Oh it's just you wishing she's gay"..but even before I started liking her I felt it, and even some people I know told me they thought she was gay too..AGH. I don't know what to do!