We really want him/her to be who it is we imagine, and then vwalla....we find out that s/he isn't who we thought at all. This is a very complicated subject actually, which requires quite a bit of time to really thrash out some sort of conclusion.
Sounds like you had chemistry with this girl and that's (I think) incredibly hard to get over, if in fact you ever really do get over it. I've wanted the same person for 20 years, and whilst I manage to periodically "get over him", I only do so far as I don't see him. Once I do see him...bang..."there I go again". The only times it doesn't work is when he's been horrible to me. Then I see him differently. I'm not drawn to him at all. However, with time...he slowly creeps back into my psyche.
Who knows how to explain these things, I don't think you can. The problem lies in the "meaning we assign" to a person. As for the looks....they are a part of the chemistry and part of that meaning. I don't think that changes. I know that the guy I want is now 20 yrs older than when I first saw him. He was only 23 when I first met him. He was hot when he was 23 and you know what? Even though he has changed, he is still hot (to me). We all look different in our 40s to our 20s, but the physical is only part of a much bigger picture. I also think that "looks" are tied to familiarity. In other words - for you, the other girl is better looking, but I think it's the familiarity attached to "your story" of her that makes her better looking. There are heaps of good looking people, but it doesn't mean we are attracted to them all. I've had a guy chasing me for the last 5 years, who is almost 14 years younger and very good looking, and funny and many things...BUT...there is no chemistry. He says the loveliest things but he can't move me emotionally at all.
Good on you for recognising what you will and won't put up with. I've heard a few stories where good looking people tend to be assholes or just plain bitches. You don't need that. Having said that...if you're still not over "her" in 4 or 5 years then go see her again. She's probably very young and needs time to mature. There's no point in closing the door completely, because it will never close no matter how many times you slam it.

