I have a friend who has been in a partnership with another man for 10 years.  They do not live together because they do not share everything in their lives, i.e., they engage in same-sex sex acts with other partners unbeknownst to the other.  Not suffering, not by a longshot.  My friend lives a life in the closet from most of his coworkers.  

He's actually said to me that he's considering getting married to a woman because he'd like to have a family.  True story.