brother syndrome
although james had many female friends, he could not get any to date him because of his unfortunate case of brother syndrome
when a nice person has many attractive friends of the opposite sex, but all view him/her in a brotherly light, and have no romantic feels for him/her
"although james had many female friends, he could not get any to date him because of his unfortunate case of brother syndrome" What is the definition of "brother syndrome"?