HELP! Im a girl who is bi and has a boyfriend & likes another girl.

Im an 18yr old girl and ive been with my bf for 3 years and im bisexual. I like another girl and did stuff with her bc she started it and kept hitting on me. After that she said that it was wrong and she feels disgusting and that we should forget about it and she is completely straight EVEN though she has started sexual stuff with me 4 times. And she says she doesn't like me, even though she called me up alot around 11pm each night to have phone sex.
she also said SHE ISN'T ATTRACTED TO OTHER GIRLS ITS JUST ME.
Do you think she likes me or is into girls?
What should I do?

You shouldn't cheat!

Maybe she like you or maybe NOT! you can't know , and if she tells you she isn't attracted to you anymore or don't like you and tell you she straight again , everybody lie about something at any time . This girl is playing around with you ! maybe she is attracted to other girls and so what ... let her be like what ever she want to be ... live your life and forget about her , you'll find better then her or just keep dating your boyfriend "the best thing you do" .

Well, the next time she tries doing something sexual with you, just cut her off. Let's see what she is going to say then. ;)

Well, she views you as a fuck buddy and your kinda horrible for cheating on your bf. Sorry, but.....shame on you for falling for it.
Next time she hits on you, just walk out.