Why does he treat me differently then he did the other girls he has dated? Good or Bad?

I have dated my guy for 2 years. I am head over heels for him but I sometimes feel like he is not the same with me. I know we love each-other but I am not sure if he is as excited..infatuated with me like he has been in the past with other girls. He would spend hundreds of dollars to visit and wine and dine a girl, write her and tell her he almost had a seizure b/c he didn't talk to her, that her sent was still on his pillow and was going to buy a gallon of it, and he even sent her e cards frequently..he has only sent me one, he has sent me e mails like: here is the e mail I promised, and I don't think he even knows if I wear perfume..I know it sounds a little petty but I just want him to be happy. ..and feeling like this kinda hurts my pride..like im not Worth it..:(