When it comes to marriage it is between two people a man and a woman and so it is not only the man's responsibility to keep or maintain unity and togetherness in the marriage the woman is also involve, now the reason why I'm saying so is because a man may have the best quality that can keep marriage but the wife is still frustrating him and a time will come when the man won't hold his self again and he will react and it may lead to ending the marriage, so the man has his own responsibility things he should do or attitude he should carry that will keep the marriage and the woman also has her responsibility and attitude and she should carry in other to keep the marriage together.
Now for a man there are some qualities he should have in other to maintain a healthy marriage and that is loving his wife, being patient with his wife, tolerance, respect, helping out in house chores, being not just a husband but a father, if a man has all this qualities then it is possible for the marriage to be healthy and last.
Also there are some qualities a woman should have in other to make the relationship healthy which is tolerance, respect and obedient, love and assistance, with this the family will be very healthy and will last.