Begging u guys...really need some advice. PLEASE!!?

So lately I've only been able to see my boyfriend every other day because of our work schedules. Tomorrow is my night to stay with him, however, it is his best female friend's birthday.I know I am welcome to come along, but things are a bit complicated. She is a bit older than him, and in fact used to be his roomate. Towards the end of their time living together, things got very strange between she and I. We have talked about it since and get along alright now, but I still feel uncomfortable being around she and my boyfriend at the same time. I dont think she wants to be with him...She is just one of those girls who needs to believe that EVERYONE is in love with her, so needless to say she demands his attention.She even told him once that ';She and he had way more in common than he and I, except for sex.'; My boyfriend has been on my side all along, admitting that she treated me badly and even calling her out on it on several occasions.I know that he chose me, and wants to be with me, but the cutsie little way that they act around each other honestly sickens me.He still buys into all of her crap and treats her like she's the best thing since sliced bread. I understand that since its her birthday and his whole crew is going out that he wants to be a part of it...I really want to be with him tomorrow (and be present to keep an eye on her, I won't lie), but I also dont want to be in this uncomfortable situation. Anyone have any suggestions?Begging u guys...really need some advice. PLEASE!!?
I would tell him how you feel about him being around this girl. If you dont want to do that, go to this party, but try and get him to leave early. you guys deserve the time you have together and it seems you have a hard time seeing them see eachother. Try and get him to see the real her and get away from that situationBegging u guys...really need some advice. PLEASE!!?
i say u go **** the other girl.. ur there first b4 her so just go it don't matter just act like what ever and go ...just have fun with ur man girl and show her he is all ur's and not a bit heir's!!!!aha..lol
go with them to the birthday party. be yourself and enjoy his other friends. don't worry about how they act... youre the one he's going home with. don't give up your night with him because of her.
tell your bf you wish you could come but thats the same day your boss decides to be a huge dick and make you stay late or your mom got the cold or whatever makes sense and pertains to your life. Talk to one of his boys in the crew to watch how your bf and her react together and he'll tell you watever they did the next day. Of course, you can't be there to make sure they don't do anything but wouldn't you rather not be there to let your bf make the decision to or to not do anything with her. Then, you truly know what they do when you're not there. make sure one of the boys isn't your bf's best freind or anything, or he'll surely rat you out later.
sucks bad dude. as for the immediate problem, id suck it up and go. im a jealous girl so id like to keep an eye on my guy especially with a chick like that running around. shes overstepping her boundaries and it seems like hes fine with it cus there just friends but it doesnt stop it from bothering you. plus... if you didnt go youd keep on wondering what exactly did happen that night of partying. id rather go and maybe be ok [as you said hes on your side] then wonder what exactly she did.