Transgender fiance

Hey girls. So I just found out my fiance is transgender. He is going to a she. This will be happening after our wedding in October. He has not talked to me about this previously and I had no idea. He's planning on going on the pills and getting an operation done after our wedding has happened. He is telling people when he feels ready so my parents dont even know yet. Idk if they ever will because he's afraid they wont talk to him again after this and knowing they wont support my decision if I want to stay. He says to give it more time. I'm trying. Idk which way to turn right now or which direction I should go in whether to go or stay. Idk where I see myself but we did talk a lot yesterday and are still talking today to answer any questions and to figure out where we should go from here. I cried all day yesterday about it because I am so overwhelmed and conflicted. It says again I will be going through the stages of grief (already did that one time before) and that he is seeing or talking to a counselor. He still wants to be with me. I'm trying to find the right direction to go in. Any help will be gladly appreciated. Thanks