I hate to say it but you just SCREWED UP! Men hate rejection and the hardest thing a man does in life is convincing himself that he needs to give up the idea that Mrs. Right is right in front of him and not just around the corner. Yes, you should have your own dreams and if a large wedding is a dream why can't you fall in love twice. Elope and have a freaking blast on a cruise or fantastic road trip and then plan for the perfect wedding because you would be at a bigger advantage, you already have the man. No cold feet, no break up, just a dream day and another trip to some place great.
Did you ever consider his dream marriage? He may have had plans that you didn't know about so when you crashed in with " my dream I want..." you made him start re-thinking is this what it will be like, maybe I need more time to see if we will work out. Now you have to wait however long it takes him to convince himself that he should marry you. Most women can't handle this wait period. Arguments either dont happen because the want to speed up the process or they start happening because they feel their life is on hold. Pretty soon you will want to force the move in saying it saves money but he will think well you have been doing it and you didn't know when we would or if we would marry. You will change because you no longer want to wait for something you could have had. You have 3 option
Tell him it was selfish of you to not consider his desire to want to get married, after all it's his special day too! Then tell him how much you love him and would want nothing more than to run off and marry him but a piece of your heart wants the story dream. Then pitch him the I love you so much I would marry you again concept. Also point out about consolidating and really determining whether we are serious or just going through the motions.
Next is to tell him that you are confused and feel he is sending a signal that reflects that he got hurt by your reply, explain that if we are to become married and be successful in it we need good communication. We shouldn't assume things on seriously matters especially when we should love each other enough to want to be on the same accord. You can try to take about it from there.
Last is the sit and wait ( worst) you have a 50/50 of him changing his mind to ask you again or you guys breaking up due to both of you changing all because you now are pushing forward and he is now on the brakes. If you push a man for the wrong reasons he will fall on you, get up and leave.