Is this retaliation?

My fiance and I have worked at a company for 5 years now. I have been a shift runner for 4 years and 10 months he has been a GM for about 2 1/2 years, a couple days ago they demoted him for no reason moved him to a different store and made his assitant GM. Well my hours are getting cut in HALF and they wont work around my schedule at all the new GM wants me to work the short shifts at night and when i said that ive always been opening shift runner he told me he no longer wanted me to open shift, I have three kids and since my fiance took a 200 dollar pay cut we really cant afford a babysitter. I feel as if im being treated unfair and was wondering if there is anything at all I can do about this? I will also add that the new GM's wife has only worked there for 2 yrs and has always been a shift runner if needed but always a rush insider which means she only gets short shifts at night, is now getting all of my hours!