<human>: Summarize the given text in a few sentences.

Brief dating history. I have dated two girls. One sophomore year of highschool for about six months, and (most recently) the [19f] junior year of highschool for about 2 years.  

I am now consciously over her (finally) and looking to move on to flirting with others. But I noticed something strange.  

I have always had almost an obsession with finding a girl who is prettier/hotter than my last girlfriend (this has been in my character for as long as i can remember). I myself have become more attractive, which i think may be contributing to this urge. There is something about moving "down" in the quality of attractiveness which i dislike for reasons i can not explain. 

Of course, I am always looking at personality for long term relationships, but i take it as a personal loss if I do not find someone more attractive than the last.  This was something I enjoyed about my last girlfriend. She was much nicer to me which i really really enjoyed, and much prettier than my last. I felt accomplished and (this might be shallow) but it was a nice confidence boost to see my ex when i had my new wonderful girlfriend around. 

Has anyone else encountered this? Have you run into a point where you just CAN'T find anyone more attractive (physically and emotionally) than the last? Or is there always someone more attractive physically and emotionally in your eyes?
<bot>: Always looking for an upgrade in a new girl. Is this normal, natural? Is there a point where it can't happen anymore and you have to downgrade?