hmm i would love to help, but i think i need some more details on you and the other girl. if you could be more descriptive with everything that went on between you two that would be great. lol. typical guy answer.
now, you mentioned that you've had some questions about your sexuality? perhaps its been on your mind for quite sometime and its finally carried over into you dreams? If you hadnt ever questioned your sexuality i would probably say, its not a big deal, it doesnt really mean anything, but because of the circumstances i would say its your way of dealing with it? You said you were quite comfortable with it in the dream, i say give it a shot in real life. im sure if you mentioned it to your b/f he would prob be more then willing to bring another female on board so you can experiment, i know i would.