We can't make either you or your wife want to stay married. And obviously your 5 children can't either. It is up to the two of you to find it within yourselves and to act nicely to each other. As long as you both go around saying "I don't love you" or "I never loved you the way a spouse should", or any of the many negative things that you tell each other, your marriage will be bad. If you want a good marriage, you need to talk nicely to each other.
You have not convinced me that you and she never loved each other as married people should. You have 5 children. To me, that shows that you were loving each other pretty good there.
Happiness is a state of mind. If you want to be happy, change your mind. Think about it.
