Well I can understand you are upset about the porn, I would be too. I also know you are tired from all the hard work you do.
If you want to stay married and it sounds like you do, you can try to find ways to be what your husband needs when you are alone. You mentioned you have family, can they take the kids the next time your husband is home and have a romantic evening with him?
He is a guy and they need sex. You shouldn't feel like a piece of meat, this is your husband. Men have those expectations and if they don't get want they want they look elsewhere sometimes. It's not your fault, but try to see it from his side.
A lot of men want a lady in the street and a freak in bed, so you could work on that. Try to expand your mind on that a little. Buy a book on positions or something and some new lingerie, tell him you want to try something different. May do wonders for both of you.
My husband loves that kind of stuff, and even does the dishes and cooks a little now!