That is one of the risks that you have when coming out as bisexual, some people don’t feel comfortable with a bi boy- or girlfriend. I am over it now, I moved on. I told myself that if she doesn’t accept me for who I am, she isn’t the right person for me anyway. And that is true, if someone rejects you, based solely on your sexuality instead of your personality, they don’t deserve you. Not everyone will reject you for being bi. Some people are even really into it. Most guys like the idea that their girlfriend is bi. But there sure do exist people who are really turned off by that idea, and that is sad, but you shouldn’t hold a grudge. If you get rejected based on your sexuality, the best thing you can do, is to move on, and forget about that person, because they don’t deserve you. You will find someone one day, who will accept you the way you are.