I have a question about dual agency disclosure form.?

I went to look at a condo that was being showed by a real estate agent. I made an offer and a few days later I was told they accepted the offer. The RE guy told me to get working on my mortgage and finding an attorney. A week and a half later after Ive got the ball rolling and paid money for my mortgage app he tells me someone made a higher offer on the apt. I was upset and shoked as I thought they were not showing the apt anymore since they accepted my offer. A few days later he calls to tell me the second offer fell through and Im next in line again. At the same time he mentions needing to fax me a dual agency disclousure form he wants me to sign.The way it looks to me is he should have given me this form the day I looked at the apt or atleast the day I made my offer. He is totally stressing this form now as I have not signed and sent back. He said he will get in trouble if the state asks for it. I still just dont understand why I need to sign this form now. Can anyone help?