@Bella Dea,
i can agree with that 100%... my boyfriend is bi, and he has done a lot more with guys than i have, but its not a problem. i know he loves me and he wont do anything to hurt me, including cheating. and as far as leaving me for a guy is concerned, the way i see it is if he can't be happy with me then i want him to be with whoever does make him happy. that's all that really matters to me.
i also think its actually kinda funny when we go walking in the mall and we both turn to gaze at the picture in hollister of the hot topless guy with a 6 pack =)
i have also had several bisexual boyfriends in the past, i think i'm subconsciously attracted to bisexual men or something. i never have seen a problem with it.