Hot and Cold

So my guy and I have really hit it off we have so much in common and we really enjoy each others company. Granted we haven't been officially dating, but we have kissed and he has said that he wants to start a relationship with me, but worries it would be too soon. Lately, he has been a bit different, we still hangout, but he's been sending me mixed signals, I don't feel the same warmth like before and he seems a little distracted/different. When I asked him he said we'll talk about this on Thursday....but I don't know what to think I'm so confused. I'm half terrified because I don't know what is going to happen.