in a rut

I feel like my relationship with my husband is in a rut. we have been together for almost 8 years. Married for about a year and have a 2 year old son, and another baby on the way. I feel.like every few months, we seem to go through this. there will be times where we can't get enough of each other...and then it just stops. when it stops, the arguing seems to start. it is usually over money. I contribute as best as I can, and make only slightly less than him. however, he seems to think I spend money needlessly behind his back. I don't even have access to a car or the debit card, so it's not true...its just that I pay the bills and we never have anything left over :( I feel like he is starting to resent me for our money problems. I have been in debt since 2e got together, but will finally be debt free in June. I also helped him.pay off a good portion of his debt last year that he seems.tp forget about. I feel like lot.would improve if I could find a to contribute more. I already work full time. I've been looking into maybe working with a direct sales company? any recommendations? that don't cost much to get started (we have no extra money for this). something where I don't have to have a massive social media presence?