Im in love with my gay friend. Am i getting played?

ok this is the situation. i met this girl at work. she would always come up to me and ask me if i wanted to take her out or to the movies. i would just play it off and say no because i always thought she was just playing around and i didnt have a car. when i told her that excuse she would offer to borrow someones car and pick me up.when i would say no i would completely blow her off and show no interest but she was still persistent.
this would go on for about a year. i finally get a car and one day i just said i would take her up since she seems like she likes me. so she approach me and ask me again we talk and she gives me her number. we start talking on the phone and she eventually invites me over to her house to talk and chill. one day i go over there, she gets in the car and we sit in front of her house and start talking. out of nowhere she comes out and tell me she is gay/bi.
that surprises me because there are no signs of it all, and iwas thinking she liked me. i decide to just be friends with her and just look at her like a male friend. so just about everyday after that im over her house and we are talking on the phone till we start talking about exs. so im telling her about a past failed relationship then she just asks me"well why dont you talk to me?" im confused because ididn't think she was thinking like that.
Im like wtf you are gay, but she says gives me the resons she like me. she is really cool and different from a lot of girls plus im still kinda confused about her so i decide for us to take it slow,because starting fast relationships never work out. she is starting college soon and i tell her jokingly if we still are good friends by the time she is done i will marry her. she takes it serious. we agree that we would take it slow and wait. she asks me would i wait till marrage for sex and i say yeah. we even agree that i wont see any other females, she wont see any men. i tell her no females and gets silent for and second and says she might see a female.
i think nothing of it because we are friends and just go on.weeks past and things kinda pick up. first she start introducing me to her family. then she tells them i might be the one she marry and yada yada. when we hang out she shows me all type of wedding dresses and cakes, and as time pass she talk about children and raising a family. so now im thinking she really like me and i start to fall for her. we call each other "baby" and hug, but we never kiss. i kiss her on the cheek but she doesn't kiss me back.
everything is going ok till a week or 2 later when things start to change. we stop hanging out as much as we did before, less talking on the phone and she doesn't really want to go out anywhere with me. by this time ive got to know her really well and i fall in love with her. i realize she is the only girl i want and i cant even imagine my future without her. i cant even imagine sex with another girl but her, and thats a first.
things start changing and im thinking maybe she doesn't like me anymore. actually im quite confused if she likes me or not so one day i just come out and ask her does she still like me as much as i like her and she always say yes. well time goes on and one day i find out she has a girlfriend. not only that , she is in love with her. that makes me wonder things. she doesn't know that i know, and so idecide to ask her questions like ''would she marry a female?'' ''would she raise children with a female?'' and other questions like that, i mean she is and has been in love with females before so its nothing wrong with me wondering those things right?
she answers every question with a mean "No!'' and explains why she wouldn't do that type of stuff. she say she likes girls but doesn't like them like that. me asking those questions seem to bother and irratate her. by this time i really cant tell if she like me at all. its nothing like it was befpre. i decide to ask her if she has a girlfriend when i 100% know she does. every time i ask her she lies.every single time. then she gets mad because she thinks i think she is lieing when she is. now im at this point, me and her agreed on things but how is anything we talked about possible when she is deeply in love a her girlfriend? i mean, i know she is not gonna just drop her for me. if she graduate from college and they are still in love where do i stand?
i go back and ask her those questions again because im so confused about the situation but me askingg seems to make matters worse. she still tells me lies, like she is single and doesn't have sex when i have 100% proof she does. at this point we seem just like mere friends, and it doesn't seem like she me. i keep asking her and tell her to be honest and she says she still like me the same. i decide to test her by just completely cutting her off, and starting an argument with her just to see what shee will do, she always comes around and shows me
she like me enough to not let me go but then it changes.
i dunno,
am i getting played? am i overreacting? why does she blatantly lie to me about her gf? i have proof she has and is in love with her gf, should i wait on her? if i call her right now and ask if she still wants to marry me and everything we agreed on she will say yes, but we almost seem less than friends. and she doesn't show it.
oh also i ttold how deep i feel about her and that i love her just to see what happen and she told me she love me too.
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