I am on the deed /title to the house my fiance bought. I didn't pay anything for it, he paid cash. Now he is threatening to kick me out. Can he??

You are on title and, unless there is some writing to the contrary you are a deeded owner of the property. Under the facts as presented (how the deed reads is critical), either he buys you out or you buy him out. If there is a mortgage, unless there is some kind of release, you are still liable to the finance company for the mortgage equally with the former fiance.  You would be well advised to seek legal counsel on this.