I am sorry it's been tough.

Since you have your own place, after you completed the task of making sure he is clean and fed go to your own place. Come, take care of business, spend some time if you feel like it and then go to your place. I assume you pay rent or mortgage or utilities for a place where you dont even reside because you are in your boyfriends place. I understand it is too late to suggest to just dump him as he is way unwell and that time passed. But you don't need to be there all the time especially since he doesn't even appreciate it. Do what you need to do and leave.

Most care givers cannot provide 24/7 care. They do have lives. So my suggestion is "have a life", take breaks from him