I can't tell you what specifically to do with your own relationship but I can tell you what I did.
I married young, in 1979. I was 19, he was 18. We also waited until marriage to be intimate. We were both "strong" Christians in my opinion at that time. However looking back now I see it differently.
We had two children, one in 1983 and the other in 1986. I became disillusioned with my husband and marriage in 1988 and began to have an affair. I left my husband, taking my children with me. We were divorced in 1990.
I then spent about a decade living a very secular life. I had a couple of relationships that lasted about 3 years each. I met a man in 1995, I became Catholic in 1997, and then married that same man in 1998. In 2003/2004 we began to have serious problems. My daughter was about 16 and there were issues between the two of them that I won't go into, but it was serious and devastating, I could see no option except divorce. There was also another woman but I was never able to actually figure out the nature of that relationship.
I was planning to leave, looking for a place to rent.
I prayed a lot, asking God to help me, to show me the way. During one of these prayer times I was suddenly enveloped by the love and passion of Christ, especially his suffering. I realized that he alone knew my suffering, he alone could relate to it, and that with him on the cross was where my suffering needed to be placed. In that moment, I knew I needed to pray for my husband and offer that suffering up for his salvation, for his good.
Marriage is a commitment not just to your spouse but to God. Marriage is a sacrament, meaning that like all sacraments the purpose is to give you graces and help you get to heaven. Your role as husband is to help you wife get to heaven, as she should be doing the same for you. You should be praying for one another. St. Thomas Aquinas says "
Love is willing the good of the other, as other." Think about this, meditate on it. Realize that your wife is to be loved not for you, but for her, for God. Marriage should not be selfish, nor should sex, you should always be giving of yourself to your spouse. Think about what you can do for her in your relationship. Believe me if you change, she will change in response. The old saying is that we can not change others, only ourselves.
Pray together. This is something my husband and I do not do, because he is not a Christian...yet.
But I pray for him daily, I ask God to bless him through me. I have seen miraculous changes in my husband over the last 12 years, and God continues to work in our marriage. It isn't perfect, we still have the typical ups and downs, but what changed is me. I have made my marriage about my relationship with God, and about the good of my husband. He has responded by loving me in a way he does not even understand. In putting him first, it changed the path to divorce that we were on to one of life long commitment.
I hope my story can help you some way. Divorce is not the answer, turn to God and put him first in your marriage and your life.
God bless.