When does a friend become a bf/gf??

Help. I am in need of some advice.
I have recently separated from my husband for about two months now. ( He has now moved out)
I have had a friend that I was spending time with for about a month. I thought we were friends hanging out. ( no naughty stuff). Last weekend he came over and basically informed me that we are bf/gf. Things will be better now and we are “ now going to be together forever and life will be grand.”
Am I missing something here ??