My mans fear of marriage!?

I'm a 28 year old female and I have been with my significant other for 5 years. We have lived together for over 4 years. We both work steady jobs. We have a dog and a cat. We make each other dinner. Everyone says we make a perfect couple or that we are their "favorite" couple. From the beginning of this relationship I wanted to marry my man. After we lived together a few years I asked him about it and he said proble in a few years. So a few more years passed and my mother started pressuring me. Then about 6 months ago I brought up marriage again. He seemed apprehensive still. I told him we already live together And that he could get a brake on his taxes if we get married. Then he agreed to get engaged. Since then I have bought a wedding dress ($1000), 2 bridesmaid dresses and accessories. I told my friends we are getting married and my family. I started looking at venues. I wanted to set the date but my man keeps putting it off. He keeps saying he wants to wait and giving me excuses like he has no $ for the wedding. I told him my family is paying for it so why does it matter if he has no $? He also said he would have never asked me to marry him and that he just agreed to get married to make me happy! That hurts me so much. Another excuse he throws at me is he came from a broken family and marriage Always ends bad. I don't know what to do now. I don't know if I should call it all off!? It's so embarrassing. I told him he should have never agreed to marry me if that's how he felt. So yea, I don't know what to do. I feel so rejected and hurt and I need some advice.