/ THE POLISH DISEASE, wanna marry a Polish girl ? read on...
No matter who one marries, it all comes down to both parties. Relationships never stay perfect for ever. Challenges will eventually come up that test the strength. That is inevitable. When this happens usually one must become selfless to fix the problem.
Relationships will be miserable, or fail, if one or both of the partners is usually self centered. So if one's priority lyes outside the marriage be it: career, drugs, friends, family, etc. - it can create a problem in the marriage.
Marriage is not for everyone at every point in their life. Sometimes one must develop themselves to a certain point financially, mentally, physically, spiritually, etc. before considering even having a romantic relationship with another human being.
And sometimes a person is never satisfied enough with the progress they have made in those areas to take on the responsibility of a relationship. They are perfectionists and will never be satisfied.
The problem comes when one is unwise and believes they can handle a relationship. Usually loneliness and/or the desire for sex will push an unready person into a relationship or marriage. One can only pray for such an individual.