The commitment phobe

So I'm on spring break and really have nothing to do. Every day I spend more and more time with JZ and Im really starting to feel something here. But apparently a bit slower than him because yesterday he told me that he thinks he's falling in love with me and then he added he knew that sounded cheesy. (too many "he's" in that sentence) ANYWAY I have to admit I kind of freaked out. My last boyfriend ended the whole thing because he said I was a "commitment phobe. " At first when I freaked out his words echoed in my head. Could it be true? Do I have a problem with the thought of a serious relationship? Or maybe was it the fact that he wanted to get married when we had nothing in common and he drove me crazy.... After talking to my best friend she reassured me that my response was common, I was just caught off-guard and that maybe I was just taking things a bit slower that JZ. I saw him again today, and I really do like him. Im just having a harder time letting my guard down than him which is seemingly making him feel more vulnerable, he told me he feels he is exposing too much. I don't want him back off, it took allot for him to get to this point, but I don't feel ready to expose myself completely either. Lets just see what happens...