Hi there. Like one poster said low libido can have many underlining causes. It could be anything from lack of proper hormones being made in the body or a sexual trauma. If you are interested in hormone testing I would start there first. Then you can find out which direction to go in. Unfortunately being in your relationship many lines have been crossed. You have to decide what you are willing to put up with to be happy. If there is away for both of you to agree to help and repair your relationship then great. But if he insists on being unfaithful etc., you might want to consider what options are best for you. Everyone deserves to be happy and treated with respect. Regardless if you are single or married. That is just my opinion. I don't know you personally or the full circumstances of your marriage. Hope this helps you.