well Yack I had a similar experience. My husband to be arrived at the airport with only one thing in his mind. He was going to call it off. He didn't want to go through with it. He wanted out. When he saw me though everything that he was planning to say to me, all went down the drain. 21 years later we are happily married. So I think your boyfriend is just extremely scared. You'll see that he will change. Especially as it's him who brought up the subject first. I really hope it works out for you Yack