You was In Mirror/FNF HIT Single Mod, You was as Silly Billy/Role or Yourself Oc, you can shapeshift or shrinking/turn into someone or mimic, your gf was still with you behind you, u always felt someone behind you or someones appearance behind, but you know no one was behind, ur gf never leave ur side she was spirit/ghost/demon that was red, you was stuck in mirror for decades or more for years without your girlfriend she is gone and you are alone only with yourself and nothing more, then she fly to you and hug you from behind

Herself: Please don't cry, I'm here, I will stay with you forever and never leave you like this alone she say looking at you and hugging you she have friendly tone (FanArt Credit: TheKnackMaster77 on Twitter/X)