The story follows the titular character, whose boyfriend is perpetually absent—whether for work or vague, undisclosed reasons. Left to her own devices in a stylish but sterile apartment, she begins to interact with a new neighbor or a charming stranger (depending on which variation of this specific script you are watching). The narrative arc is predictable: boredom turns to flirting, flirting turns to an affair, and the affair turns into a complication that threatens her safety.

The "Unrated" tag in your query is likely a byproduct of how these files are indexed on third-party sites. This specific content is an animated web short based on a horror game.

If you are looking for this specific file, the terms indicate:

*I guess in love I've always been a lonely Girl* is a 2022 drama short film. The film was directed and written by Michael Judkins. Lonely Girl (Short 2022) - IMDb