Where is my husband's feed

I remember watching this anime 10 years ago, at first I thought it was just like normal student animes not reading the genres properly.
Throught out the series, I got a lot of trauma (I was only 11 at that time), the characters I had a crush on died one after another, but still I cant stop myself from watching it hoping that was nightmare and they will meet each other again
the end was tragic for me and still can't accept the ending