Girlfriend doesnt like her boyfriends best friend..... what should I do?

I am best friends with this guy, and his girlfriend does not like me one bit!!! she uses me all the time because im vulnerable, and she knows im the type of girl who doesnt start drama or ***** about doing things for others.... anyways I hung out with her and her her boyfriend/ my best friend, and she kept ditching me and him, so him and I just hung out without her... after like 3 hours, she texted him to meet her at a place, so we met her.. she was PISSED!! and even more pissed when she found out that (she had to go, and she wanted him to take her home) he wasnt gonna leave with her, and that he was gonna stay at desert ridge with me until I had to go home, so she was like whatever and stormed off!! now she put all over her facebook/myspace "never again.. EVER will that happen again!!!" and im pretty sure that quote had something to do with me hanging out with her bf/ MY best friend!!! she absolutely HATES MY GUTS, not because of the type of person that I am, but the fact that she is jealous of the relationship that I have with her bf.... she cant talk to him because he refuses to talk to her, but he will talk to me about EVERYTHING and anything, and she knows that, and she hates me for it!! Him and I look more like a couple than her and him because him and I are ALWAYS laughing together, and having fun, and linking arms, and such, and well I have no idea what to do about his gf... she is always making him feel like he cant hang out with me (although he still does because he told her she has no control over who he wants to hang out with) and he HATES when she does that!!! one of these days she is either gonna drive him to dumping her (more likely) or not hanging out with me (not likely to happen) so.... grr what should I do?? is there anything I can do??