How would you react if your boyfriend told you he was bisexual?

Hypothetical question: Ladies, your boyfriend, trusting you as he does, comes out to you telling you he thinks he’s bisexual. He doesn’t want to break up or anything of that sort or start seeing anyone else. He just wanted you to know. Would you be upset? Angry? Fine with it? Would it affect the relationship in any way at all? Give me your opinions!