I think most people at some point have felt the way you are feeling right now. We just celebrated 20 yrs of marriage and all 20 yrs were not a bed of roses.....of course there are ups and down.
One thing we did was to have a priority of date night once a week at least. We had date nights before our daughter was born 14 yrs ago and we continued after she was born. We have rarely missed a date night. I think it is one of the most important things we have kept up. Far worth the cost of a sitter to stay connected to your spouse. You don't have to do something fancy every week. We enjoy fine dining, maybe some dancing and fine wine. Other times, I might tag along while he plays golf, go workout together, etc.
Communication is a huge key. We have wide open lines here where no topic is off limits. Those lines of communication are wide open with our daughter as well. Also, my husband is on the road a lot and another form of communication we use is yahoo messenger and text messaging.
Marriage is a lot of hard work. I know my husband works extremely hard for our family and is proud to provide such a nice life and afford me to be a SAHM. I know this is also stressful on him because he has a hard job.
EVERY MORNING......when he leaves this house, I walk him to the garage and to his car and give him a little kiss (does not have to be romantic) before he heads out. EVERY AFTERNOON our dogs get SO excited when I say he is coming home. They watch for him and when he drives up, I let them greet him and it always puts a smile of his face from these 3 adorable dogs who love him unconditionally. I also greet him with a little kiss, welcome him home, get a glass of wine for him, daughter greets him every afternoon as well.
These are just some routines we have that I believe help keep the bond strong. EVEN if I might be upset and not wanting to do this for some reason or another....I DO IT. He is my husband and he has provided me with a beautiful life.
I hope something I said helps.