If you were a superhero would you be able to put your job before love?
In Superman 2 Superman first chooses love over his responsibility to Earth. Then he is able to choose again and he realizes that his first duty is to Earth. He erases Lois' memory and takes up the single geek life once more. Would you be able to make that same decision?
The super hero is human with special capabilities, so of course being human would not stop him/her from falling in love. A responcible superhero should follow their code to protect and serve the human race though (over love).