He asked me to marry him, then changed his mind?

So, my boyfriend asked me to marry him about 3 or 4 months ago and he just told me he doesn't know what he wants in life and he needs to think about it and wait on the marriage thing. He says he still wants to be with me, but he isn't sure if he wants to marry me anymore. I'm really confused cuz he used to tell EVERYONE that I was his fiancé. He hardly ever called me his girlfriend. I am confused and I feel as if I was broken up with, so that is how my mind is reacting, but he's still acting like we're together so it throws my mind and emotions off balance. I'm not really sure what to do here.. Any advice? I feel like I'm not good enough if he has to redecide if he wants to marry me. What could it be??
He asked me to marry him, then changed his mind?
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