Advice please

I need advice or confort or something. I am literally at my wits end with my husband. I have a very high sex drive and he just doesn't. I have to beg for sex and i barely get it once a week. If we have sex i have to stay up late because he usually only wants to have sex right before he falls asleep. Then he usually only likes one position and always gets off before i can. We got in a big fight about it tonight and now hes sleeping on the couch. We only had sex once during our honeymoon and not even on our wedding night. He says he is tired and worn out, but he barely does anything besides help with the kids. I was working over 80 hours a week as a floor nurse, but since the start of the year Ive dropped to 40 and I have been taking a full load of classes. He works 4 days a week from home as a customer service representative. Before that he went about 7 months with no job, as my job gives us what we need. During those months laundry piled up and the house was always a wreck. I have had multiple conversations about how I need affection. I don't think he is cheating because he literally never leaves the house unless we are together. I honestly have been having thoughts of having an affair, but then I feel like a horrible person. I would never really do it but dang! Has anyone else felt this way? His one saving grace is the way he loves my kids and treat them as if they are his.