Help me people!! (am I being TOO sensitive, btw I am a Cancer sun and moon)?

Okay so here is the situation... I don't know why I asked but I did. I knew it would hurt me no matter what he said but my curiosity killed me. I asked my Capricorn bf what his ex was like. So basically he told me how her annoying best friend who was always in their business was what made him break up with her. What really bothered me and made me so sad was the thought that if her best friend didn't exsist he would still be with her. I said so if it wasn't for her best friend you and I would never be? And when I started tearing up he said "who knows where life takes oneself" But to be honest that made me feel so empty. I know its like cheesy or something but I kind of wanted him to feel like we were soul mates or something. He told me how she was like a super genius and sweet. (we always joke about how I should really be blonde cause I am kinda.. well... dumb at least at logical thinking) I asked him that what am I and he said beautiful, y, easy and fun to talk to and crazy as hell. The way he said his ex was smarter than him made me have the impression that he likes that I am 'dumber' than him so he feels more like a man or something! lol I am used to getting attention for how crazy and funny I am and not my intellectualness... But anyways he said that he has me now and there is nothing to be jealous of, and I am special and blah blah blah. But why does it still hurt me so much? Is it because I am a freakking Cancer? do you think I am just to feel this sadness. I am not mad at him at all just sorrow filled. =(