I think if you seriously want to give continue with your marriage you have to work together to solve any trust issues that you both may have. It takes a very long time to heal those emotional scars, but in the end it should make you a much stronger couple.
Sit down and talk, take the kids out together, go shopping together, cook meals for her, help with the housework, treat her like a lady, and in return you will get so much back from your family!!
Stay strong