My boyfriend told me the other night he had a dream of proposing to me IM not sure what that means

I think it means he had a dream where he proposed to you

I'm guessing the deep meaning behind it is that he had a dream of proposing to you.

Why don't you ask him what it means?

I had a dream where I married Kate Beckinsale... well, I'm still not married to her.

Sometimes a dream is a dream, sometimes there is meaning. It could also be him testing the grounds by having "A Dream" of something he wants to do without suggesting or committing to anything.

Sometimes it is just a Cigar.