He does not sound like material for a quality relationship. You mention rules, I made this rule recently about how I do not get emotionally involved with anyone (whether friendship or romantic) who doesn't believe that psychology has any point because it means they are not going to keep doing personal growth to keep up in life rather than get stuck on a level.

The rule itself was "do not get emotionally involved with anyone who doesn't do either of 1) have a job or any serious purpose/engagement with something 2) go to therapy or do serious psychoeducation working on themselves". But just having a job and not doing any personal growth isn't enough, of course, this rule is simply the absolute minimum, to quickly decide to avoid people who would truly be a waste of my time for a relationship.

The idea would apply in your case too because this guy has depression but doesn't do anything about it. And he lives with his mother. Not a mature adult, I'm afraid.... Don't expect a quality relationship, again.

Hope this helped some.