You have been going through a rough relationship and it is tearing you apart. To the world, you seem a happy couple and you can't share the pain with anyone else perhaps you don't want to look miserable or your pain will cause a lot of distress to your near ones who you share it with and they can't help you.
You are stuck in the relationship for any number of reasons. You feel it is getting too heavy to bear, who would you share it with !!!