In the beginning when she told me that she was bisexual, I didn't really think too much about it because it wasn't something - bisexuality - that I knew too much about.
And what I've seen and read has not been the least bit encouraging.
There are also tricky things in being bisexual that most people don't have to think about.
For instance, when meeting new female friends, I often tell them I am bisexual as soon as possible, to avoid an uncomfortable situation later, if, say, we end up changing in front of each other when shopping, and then after they find out I am attracted to women too, they might feel violated in some way, and I would NEVER want to make someone uncomfortable, so I lay my cards on the table and let them make their decisions and decide their comfort level with me based on the truth of my attractions.
If I knew then what I know now about bisexual women, my relationship with my girlfriend would have ended nanoseconds after she admitted to me that she was bisexual.
Thankfully, my relationship with her is grinding to a screeching halt as I type this.
Why would you then expect your girlfriend to stop being bisexual because she is in love?