If you are not comfortable with simple communication with him it might be best if you are not in a relationship with him.
Boyfriend sometimes is at my house at breakfast. Now, he can't get the WalMart breakfasts he brings for him. He said he will have to start eating my oatmeal and fruit. How can I tell him, I am not comfortable with that???
"____ , I am not your mother and I am not fixing you breakfast everyday. Buy your own oatmeal and fruit."
So tell him to go home at night. Then he can do and have whatever he wants for breakfast. You aren't his mother or wife.