You say you don't believe that, but at the same time you don't know how to respond.. perhaps there is a little part of yourself that DOES think that? Idk :/ If you really don't believe he's the cause, though, all you can do is reassure him that it's not his fault. It's normal to feel guilty about ourselves when someone we love feels bad If you feel worse now, it might have to do with a variety of reasons, not necessarely related to your H.

About his comments, you should give more details, but it doesnt't seem like he wants to put the blame on you.. I guess he's just stressed out because of all of this. If these comments bothers you, perhaps just talk to him about this..