Struggling

Hi there just hoping for some advice. I have been in a relationship with my partner for 3 years now and most of the time he has been suffering from mental health problems. He doesn’t like going out pretty much when we get time together wants to chill and watch films not do dates nights and basically very depressed! I am finding it harder to support him because where do you draw the line I’ve tried so hard to get him emotional and professional support and do everything for him. I don’t think he appreciates me or any of it and in fact takes me for granted. I don’t know if I can continue you in a relationship where I feel he’s not going to get any better. Anyone with experience of this before please help?