Moving on base as fiance?

My fiancé and I have been long distance for a year and a half. We’ve already agreed to get married, but he feels like getting married in five months is too soon. We just started planning the actual wedding, but we’ve been talking about this for a few months. Now he’s asking me to move out there..no married..and find an apartment there. He feels like things are moving too fast with planning, yet he wants me to move by base so we could see each other every day. I don’t want to make all of these changes in my life without us getting married. We’ve been together for nearly 3 years. It just sounds like a bad idea, because if something were to change or happen at his job, I wouldn’t be his wife. There’s nothing I could do. What do you think?