I thought it is either better in a relationship if you are seen as an equal or if you are better looking than her because that makes her desire you more, whereas if you are seen less attractive than her, she will not put in much effort or it feels like she just settled with you for the time being.

Is this a flaw thought?

I had this girl say she feel like between the both of us, she is more attractive. I mean , of course bias because everyone think they are better looking than anyone else. however when shown pic of us as a couple, people will say we look good together, or I look fine. Let's face it if any of her friends say you can do better, it will force her to evaluate you. However, when she compares me to a celebrity she fancies she will undoubtedly say that guy is def more attractive/hotter than me in a movie/etc).

It was always said that a women should always look better than a man because 1) she has makeup for enhancement and 2) she will always feel insecure in a relationship if the guy is "out of her league", so perhaps it is normal and I'm overthinking this?

I mean who wouldn't want to be that hot guy that is out of a girl's league?