Most Helpful Girl
Whatever it is, don't give up on your marriage. Every long relationship goes through a period like that, just try to get back to the beginning where everything was great. Identify the problem and solve it. If is something she can do, talk to her, let her know what you need.
Sometimes people think that leaving is a solution. But whatever person you find in the future, you will get kind of "sick" of her eventually because it will get old too. When the lights in the house goes out you don't throw the house away and get a new one right? You just fix the lights. So, just fix the lights in your marriage.
Most Helpful Guy
Try to identify what it is, or why and then you talk to her about it and try to come to a solution to change or fix the issue.