Am I setting myself up for disappointment?

I think that my boyfriend is showing signs that he is VERY serious about me, but here is my problem: I don't believe my own intuition because I care about him so much I am super afraid I am imagining it and I will only end up heartbroken, so I tend to act like I don't care when he says things to me!! For example, he asked me about diamond rings, I acted like they were no big deal. He even asked me if I wanted to go house-hunting with him and my reply was, "I guess." So I am scared I will scare him off because I know that he could walk away from me at any moment! Is there anything I can do to keep myself from being paranoid? Am I going to ruin it all or am I really just setting my sights too high?