Dreaming of Xs doesn't mean we miss them. They were a big part of our daily lives for a long time.
I'd say the fears you expressed here are probably what is triggering the dreams rather than the other way around.
Everyone's timeline is different. My DD was in Feb 12 and I can see myself making the same mistakes if I jump into anything too soon. I'm thinking my timeline for grieving/healing will be 2-5 years - who knows how long after that I'll find someone I think I might like to take risk on.
If things are feeling like they are going too fast for you its OK to put on the brakes if you want to.