Majr crisis !! i need help PlZ?

theres a partu this weekend and im goin with some friends. my crush is going to be there but another girl tht likes him is goin to be there too. me and him used to have a thing and were still friends but i still hve feelings for him. he likes the girl that lkes him but they dont kno it yet. the two big probllms r that i hve to drive the girl that likes him to my other friens house cuz both of them r havin a sleepover nd the other problem is that i want to make a move on my crush but him ndthe girl will probably be togthr the whole time nd i dont kno if i could hold in crying. it my first party tho so i wanna go. what should i do?