Can relationships be fixed?

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After 8 years im tired of trying to make this relationship work. At the same time im not sure if im ready to take this step even though i know i want to. I have 3 toddlers so I really wish it could work out but we are not a priority to him. Hes a real good guy with a good job but being on drugs makes him make bad choices sometimes. I just dont know what to do. I dont work i cant afford a babysitter my mom just passed away so i also feel like im not ready to lose someone else