<human>: My SO and I have lived together for 3 years and been together for over 4. We used to have so much fun together, we would go to the beach and go on bike rides and watch movies and cuddle.

For the past couple years I've been different and I don't know why. I'm not interested in doing any of that anymore. I don't want to take our new puppy out on a walk, I don't want to cuddle, I don't want to have sex, and I really don't want to go to the movies or something. I have no desire to do anything anymore. Its so stupid but I come home and I sit on the stupid couch and it is all I have the energy to do. Even looking at the dumb couch makes me feel sick to my stomach but I just do it every single day because everything else just sounds awful. I know I'm not depressed because I definitely don't want to kill myself or anything. But even when I think about it, there isn't a single thing in my mind that could make me happier. Like starting a whole new life sounds awful because I "like" mine, but I hate how bored I am at work, and I hate how little interest in things I have. I just don't have passion for anything or anyone anymore.

I want to fix this more than anything but I don't know how. He can tell that I have no enthusiasm to go out and see a movie or something. And I feel so awful because he is the best person in the entire world. I don't want to ever lose him, but I know I will if things don't change, because he deserves better.

Can you give me the gist of the text in a nutshell?
<bot>: I've been the worst girlfriend ever for the last 2 years because of my lack of interest in anything. Not sure how to make things better.