In a relationship, nothing is fair. Of course if both parties put in 100%, it will be perfect, but then life is never perfect. Often than not, it is one party putting in more effort to maintain the relationship, and the other party not really bothering much. If he is doing everything he can to make the girl happy but she is totally unreceptive and taking him for granted, shall he then give up and go for someone else if he still loves her? Shall he opt out and just go for someone else, if he still loves the girl? Whatever one does for love is all worth it, no matter how one suffers or accommodates. Stupid as it sound to some people, but love is blind. So blind that it does not matter even if nothing is fair, even if one person ends up miserable and suffering.