Don’t get discouraged, there’s help out here and don’t take this the wrong way, your situation is more common than you think! Couples fall into a parenting rut, taking care of their jobs, kids, and other responsibilities and the relationship is the first to be sacrificed. A lot of times, especially me, when I was just done taking care of everyone else and all I wanted to do was go to sleep or be by myself to decompress!
Arrange for a babysitter, get out of the house or have the kids go to the babysitters so you both have the house to yourself. Sit down to a nice meal and hash it out, maybe there’s something going on with her she’s too embarrassed to talk about or it might be as simple as miscommunication! However, you’ll never know until you ask and if it’s done in a safe environment without the kids as a distraction, you might be quite surprised at what you find. This article,
http://bit.ly/2gRkCw2, I read something similar, but this one is far more comprehensive and includes other avenues.
It’s tough, I know, but don’t give up, keeping fighting for your family; you’re on the right track!