<human>: My fiance and I just became engaged a little less than a month ago. In that time he's gotten a much better job and I've also started working. With all of that, we've been talking about moving, starting a family, finances and all the in betweens.

My biggest concern though is that he tends to jump from idea to idea. We'll have a plan or a short-term goal and go over it together, finding the best way to attain it, only for him to change his mind completely. We were planning on opening a joint bank account later this month, and talked about it extensively. To be honest, it wasn't even my idea, but after talking it sounded good and I agreed. Last night he calls and says he doesn't want to do that anymore. He doesn't explain why and it was too late to really go in-depth about it. 

It probably doesn't sound like a big deal and the bank account issue really isn't, but it's makes me feel like he could change his mind about me just as quickly. He's done this with not only the bank account but where we're moving, getting a car, and plenty of other things. 

I've never minded changing plans, but I find myself starting to feel unsteady with him and I don't want that. I want to be with him and I know this needs to be discussed, but I have a hard time being direct and I feel like he won't understand why I feel the way I do. I'm not really sure what to tell him when he calls later. I did ask him to call so we could talk, but now I'm a bit uncertain about what to say. How should I go about dealing with this concern?

Can you condense the text into three sentences or less?
<bot>: Fiance changes his mind frequently, and recently it's been causing me some distress. Just need a little advice in talking to him about it.