How do i know if this girl is a and in to me?

i met a girl thru a mutual friend recently. she is my freind's room mate. i am married and she has a boyfriend. ever since i've met her we always catch eachother staring at eachother and i know why im staring at her (cuz i want her) but i dont know why she stares at me. my friend tells me she asks about me a lot, and me and this girl have became freinds over the course of time. we comment back and forth on myspace and stuff, but never really became really good freinds. i still see her once in a while, but she is with her boyfreind almost all the time. when the subject of gay or comes up she acts like its the worst thing in the world and she's disgusted by it...for example, the friend i have is biual and hits on her jokingly and she gets all pissy over it. but then sometimes she plays along wtih it. i cant read her!! but i want to know if all those 'staring contests' had anything to do with her wanting me as bad as i want her!even my own husband noticed the staring and asked