well, first and foremost, you're going to have to get over your ex. she has distinctly told you that you're not going to have another relationship with her so why try? it's true that one day she might turn her face the other way and accept you again, BUT most likely she will forget about you. she's not planning on having anything with you again and you're going to have to accept that.
secondly, you shouldn't compare your gfs to your past ones. it's not fair to the new gf that she is being compared to a past relationship. she doesn't deserve to be compared with other girls. the aspects that are missing in what your old gf had, is where the new gf will lack but she will have other qualities that your old gf didn't. always keep that in mind. raverboy
...this is just my perspective on the situation...