my boyfriend told she's trans today

I have no idea what to do. I support her in her choice, and I have supported others. But we've been together for three years. I've always seen her as a man. I'm scared I'm going to lose the love of my life because I'm not attracted to women. And I have so much shit going on in my life right now and I can't deal with this right now. I feel terrible but I wish this was a dream. I love her. I love her so much but this hurts. I feel betrayed. I feel like I've been lied to. She told her friends before me. I want to be there for her, and I support her.

I wish this was a dream. I feel terrible. Awful that I feel this way. I feel like a shitty human being. I've been bawling for hours on end.

But I don't know if I can stay with her. Do you guys have any advice? Please please this is so new, there was no warning except for dressing femme a few times. I don't know how to feel or act. I am freaking out. I don't want to hurt her ever, but I have a preference to men. But I love her. I love her. I don't know if I can live without her. I've the past three years she's made my life so much better. I'm so distressed. Please give me advice.