i'm not a native english speaker so my words are not as accurate as they could be
e.g. "IMO you can't dislike a person for wanting to help you..." was not an accusation in any way (it could be interpreted that way) i'm sorry if i caused any misunderstanding anywhere
i just wanted to state out that his persistence in wanting to "help" you probably means that he really wants to make you feel better or even "get over it", not that he isn't listening to you, and all the things with which he thinks he can help you are based on his experience.
there are similarities in the depressions and the way of coping with them, so there is value in having someone who has been through a depression before.
but of course when he can't shut off his narrow view that his experience is EXACTLY the same as yours.
i still think that you need to show him his limits during the conversation repeatedly, when he's stepping across it (I know I would step over it a lot for a person I cared) and only be harsh to him when he continues even though you clearly told him to stop. (I hope I put that in a comprehensible way...)

i hope i don't sound like someone who "knows it all" or who wants to tell you what to do, this is of course my interpretation of the (very little ) information i got and the experience i had so far.
actually i don't think that there is an everlasting depression where you can't "step out of" either... but i think you have enough of this topic now ^^
sorry if I may be getting on your nerves, i'm new to this forum and don't quite know what people are actually expecting from it.
if it wouldn't bother you too much we could chat (or whatever you do around here xD) i'm very interested in hearing your story
many and to you