You mean: Yek Nah Shud Do Shud! j/k 
Your sincerity may be true but that may not be helpful for him.
He has to come to terms with himself and instead of avoiding to get married because of others he needs to find any weaknesses in himself and correct them before blaming others or Allah.
How is he so sure his marriage will not work? Does he know he has some problem and is not sharing?
Let him live the life the way he likes, it is not that he is a child and he has not been told.