Help pls

I need help ... I am already 10 years married and have two children but we have 6 months of being very bad in our relationship and I feel that it was enough ... he says he wants to change, he says to try but I only see that it is getting worse and he is not interested. .. what would you do? I already talked to him in the last month about 4 times about improving and changing but he always ends up saying that he is sorry and that he is going to change and the next day is the same