Should have divorced when I had the chance

I like to keep this short and simply, but we will see how it turns out.... I have been married 5 years now. I have one stepdaughter (11). and another duaghter (3). My wife and I married for financial reasons only. At the time we were just friends with benefits. AS FRIENDS, we got married. We lived in different states and since I am SUPER attracted to her, I thought it would be a good idea to have her and her daughter live with me. We been together since. Almost 3 months ago we decided to get a divorce. It was coming from me. She was devastated. I felt really guilty about what I was going to do to the family. I have never been this close to leaving her before. This time it was REAL. After the guilt of knowing what I was putting her through I decided to stay together. Things were fine for about a month. And now I having the same feeling of divorce again. Its not that she is a bad person. I am just unhappy. She is sexually attractive. But I never want to have sex with her anymore. I just dont have any passion for her. We are like roomates, not spouses. We both have seen a marriage counselor for 8 weeks. Now we both see our own counselor. But still, I regret not leaving while I had the chance. Questions I would like to ask you all: How much marriage counseling should you do before enough is enough? Am I wrong for dragging this relationship out when I know I am unhapppy? I have considered cheating, should I? (ofcourse not, i know) Has anyone just fell out of love? If she ask me why I want to leave, I am just vague and say "I'm not happy". I have a hard time explaining this to her.

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