My boyfriend wants to be a girl.

Hello ladies, I am having a difficult time. I've been with my boyfriend for almost a year and a half now. Last night he told me the hardest thing he's ever said to anyone. He wants to be a girl. He doesn't want a sex change but he wants the body, the clothes the everything. But is still attracted to girls. He still wants to be with me and I still want to be with him. I'm just so confused and lost. And Idk what to do. Can anyone give me some good advice on how to go about this? I still love him and I'm still going to be with him. But I'm just so lost and dont know. Maybe I'm just afraid of change? He says that his personality and such won't change at all. His heart won't change. And so forth. But I'm just so scared. I'm scared for him getting hurt because he says I'm the only person he has trusted to EVER tell me that. Please help me ladies, I could use some encouragement.