Neither marriage nor live-in relationships guarantee complete happiness in all aspects. Both are a gamble. In case of a failed marriage, perhaps one has the support of the family whereas in the case of a failed live-in relationship, one may have to face it all alone in his/her privacy. AS live-in relationships are usually entered into by the bolder lot, they may not mind a failed relationship and may be in a better position to bounce back to life faster. Living with any person, even own blood relations, needs compromises and adjustments to be made by all the people concerned. So it is equally applicable in a marriage and a live-in relationship. The major difference is that in a marriage it is not very easy to leave your spouse in case of differences as families and legal complications are involved whereas in case of live-in relationships, such obstacles are absent, thereby making parting relatively simpler physically. Emotional wounds remain in broken marriages as well as broken live-in relationships.
At the end, it can only be said "To each his own".