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There are limits to what a family member can do to help someone that does not want help. If he is acutely dangerous to himself or others, then they can be forced to receive appropriate care. The method for enforcing that care varies from one state to another. However, if he has a mental health condition that is not causing them to be acutely dangerous to himself or others, the most that you can do is to encourage him to seek care and to be supportive.
It also would be reasonable for you to set limits and expectations if you are going to continue in the relationship, but that leverage can be limited if he has moved out. This leverage can be more applied if he wants to resume the relationship in the future.
If I can provide any clarification, please let me know.
You asked if he will return to his senses.
It is impossible to predict whether he will improve. The majority of people respond well to treatment, but if he refuses treatment, it cannot be said how he will do long-term.