Depression...

Jane
So I guess I have been fighting off a depression for a while now.. and I really had no idea how bad it was until today when my boyfriend told me how I seemed really unhappy and negative about every little thing.. I didn't even realize.. and then he continued to tell me how me saying "thank you" didn't help in certain situations and how he's beginning to feel like certain things he does, just doesn't even matter. I had no idea he felt this way until now.. and it has added to my depression. I feel embarrassed and sad and I feel like I did him wrong.. I am at such a loss here and have no idea which way is up.. how can I bring positivity into my relationship to where it is not forced, but is genuine? I want him to be happy as much as I want to be happy myself.he says he feels appreciated but also feels like things aren't enough sometimes.. even though I hug him as he cooks, say thank you.. I just don't know what I'm doing wrong.