Husband getting tired

I been fighting later with my husband, any little disagreements that we have he tells me to better myself, that been his favorite sentence for the last two weeks. He got me so tired with the same sentence that i told him that if he feels like im not enough for him to get another women and he said not to push him too. Lately he been talking to me with ma disrespect and he is not even like that. I really don’t know what to think at this point 🤷🏻‍♀️whenever i ask him why hes telling me to better myself he always tells me that he is trying to teach me only because im 30 and hes 38 8 years older than me. But the tone of his voice it is like he’s telling me to better myself for another damn reason that I don’t know. Neither i know in what way he’s telling me to better myself. Honestly my gut is telling me that he probably doesn’t like or want to be anymore so he’s telling me to better myself. Men are really sneaky that we can’t never guess whats really going on in their minds