Shall I become more like the girl my ex left me for?

This sounds silly i know i shouldnt care and should just move on because he is a cheating scumbag but I cant stop wondering why he cheated and why he left me ffor this woman. He went up north to uni and then out of the blue dumped me and told me he never loved me that I was nothing to him and that he had met the girl of his dreams that I was nothing in comparison to her. Physically wise shes the polar opposite to me shes quite short, quite rounded she has her head near enough shaved, whereas im quite tall a bit too skinny and hvae long hair. He told me if i ever cut my hair he'd dump me as he doesnt like girls with short hair then left me for one! He also told me he only liked girls who were going somewhere witht their lives im at uni studying a law degree whereas shes 22 left school at 15 when she got pregnant and has worked in a pub since then (thats how they met) He told me she was more succesfull thaan me and a better person becauase she had a baby young that she brought up herself (however the baby doesnt live with her its with her mum and apparantly he calls my ex daddy although they have only been together 4 weeks) he told me she has her own house which i dont (which is council flat that she doesnt have to pay for) I tried todo everything for this man I dont want to sound like some arragont pre madonna saying im so amazing im this and shes not but shes the opposite of what he told me he wanted me to be. It may be that she has a lovely personality but I cant see how a woman who a) has a child to look after yet has time to go out constantly and snort coke and b) who purposefully sleeps with another girls boyfriend behind her back fully well knowing I love him could be a nice person. Yet I love him and keep compaing myself to her why?

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