I haven't felt loved since she left

She isn't on SW any more (as far as I know) so it's safe for me to post this (hopefully). I've been in a spiral of loneliness since last year, where I've felt detached from pretty much everyone, devoid of any warmth from others no matter how much I try. Since she left, it's felt like nobody has even really remembered me, let alone felt strongly about me. I loved her, and she loved me too, but it wasn't enough and now I am a husk. It's not her fault that my mental state reacted this way - I don't have any resentment for her, because I wasn't a great person. I just... I don't know.