Re: “good looking”
I think we are confusing between a person’s nature and personality. Nature/ behaviour means the way a person conducts himself overall, his morals, his bad habits (lying, talking bad about people etc) which we can only get to know after marriage.
Personality means the way he interacts with other and the way he presents himself to the public which we can easily get to know even in one meeting. I remember a girl at a dinner who was very pretty but I just coudn’t see the way she was having her dinner. This is one aspect of personality and you don’t need to live with a person with such explicit evidences of personality.