Of course the suicide right is going to be higher, but you shouldn't compare it against the part of the population who is happily married, you would have to compare it to the people who are desperately unhappy in their marriage and don't get divorced. At the end of my marriage I still dearly loved my wife, but hadn't been happy for years and I was wishing for death to give me a noble exit from a situation I couldn't see a way out of myself.