Relationship advice!!

My boyfriend and I have been together for a while, and we've been having unprotected sex, talking about starting a family, marriage, everything.

We went on a trip this thanksgiving, where he bought me a ring. He asked me to marry him, and I said yes.

We were just talking about everything- and he said he wasn't serious.. I have a ring, I've been talking to him for days about being his fiancée now, and he said it was all a joke!

I'm two days late for my period, moody, already mentally ill, and he is playing jokes with my emotions?... what gives?