Can marriage just not agree with some men?

Marriage. There are many men who fear intimacy and being vulnerable but don't acknowledge to themselves or others this reality, as a result they come on strong but do not how to maintain intimacy in the long run. Best.
Same as women. Most men and women alike enjoy and benefit from a stable, monogymous relationship. Both sexes live longer and are healthier both mentally and physically due to having a life-long partner. There are, of course, exceptions!