So you broke up, he left you (?), because you were depressed?
You weren't treating him right...I also would like to know for what he was finding fault with you.
So now you are back together...and you know the score: you behave to his standard or he is going to dump you. AND don't get sick, or he will dump you.
Please understand that everyone follows certain behavior rules in a relationship, but they are not enumerated on a list, such as civility and respect, these are just a given. Other behaviors can be called out and discussed for a chance to change...alcohol/substance abuse, obsession with a hobby for example.
However, in this case, you are talking about his fundamental personality. He won't suddenly "get it" and do a complete sea change in his behavior to stay with you. Leaving you while you were sick said it all. He isn't going to tolerate your point of view on anything. Confronting him will be a waste of time. Or perhaps not, if he immediately dumps you again, which would be doing you a huge favor. Result, and a lot easier if he thinks it's his idea. 
You have nothing to feel guilty for. He sees your good manners and nice personality and is using that against you to train you to put up with this crap.
Have your fresh start with someone else.