I'm 40+ with 5 kids and our relationship was falling apart without me telling her because I was becoming so withdrawn. When I did tell her, she said she expected that already based on things she saw while we were living together. It was a little rocky at first and I did take her to my therapist with me. There are still some bumps in the road, but nothing marriage-shattering. If she's willing to work with you, it is possible to continue in the marriage, but communication is paramount and not just communication as you knew it before. I mean very intimate communication, no secrets. Don't let anything build up for you or her. Deal with it when it happens.