Did His Rubber Band Break?

Hi John-

My boyfriend and I have been together for 4 years and things have been good. In August, he proposed to me. We were engaged for 3 months, when he suddenly decided to call it off. I thought things were going great and now the only thing he says to me is, "I don’t know what I want right now, but I know I don't want this."

I don't understand how you can propose to someone and then just end it. I feel lost and so defeated. We haven't talked in a month an...