Agony

She's not happy. I'm the cause of it. I swore I wouldn't be the cause of her unhappiness. I don't know what to do. I don't know if I can summon the strength to leave her. Am I truly selfish enough that I would hold her to me even though she's miserable?? Apparently the answer is yes. I can't stand to lose her. It's breaking my heart that I cannot make her happy. Help.