I'm currently struggling with a lot of internalized biphobia and other hang-ups about my boyfriend's sexuality.
I've been in a monogamous relationship with my cisgender bisexual boyfriend for about a year.
You and your boyfriend are both in the process of figuring out who you are and what you want.
It's possible he'll realize you're not the person he wants to be with, ANGST, but it's also possible you'll realize he's not the person you want to be with.
Your boyfriend could be gay (some people who aren't bisexual identify as bi before coming out as gay or lesbian), and/or he could one day realize that he'd be happier with a man (just as you could one day realize that you'd be happier with a woman).
"But maybe because the potential 'pool of applicants' is over twice as big for us Bi folk, we get stuck with twice as much of this irrational fear? But here's what I do know: most Biphobia (and jealousy for that matter) is projected insecurity.
Built into the fear that someone will leave you because they 'like x or y better' is the assumption that you yourself aren't good enough." And while feelings of insecurity and jealousy can undermine a relationship, ANGST, they don't have to. "But we can turn these moments into opportunities for open communication and intimacy rather than moments of isolation and shame.
But he can tell his bi-ness makes me nervous and uncomfortable.
I think that because he appears more feminine than most men and is more often hit on by men than women, I worry that he would feel more comfortable or "normal" with a man.
Stop worrying about the next six or seven decades of your life—stop worrying about forever—and enjoy this time and this boy and this relationship for however long it lasts.