Totally agree with this assessment. She doesn’t consent to the guy’s feelings and that is her right. All a person can do is attone, be humble, provide apologies and attempt to in the most non-intrusive way (which is not at some shared party) directly and for the person.
If you are truly sorry, you will have zero issues or negative feelings for getting rejected, you get to pick up, try again, and wait for acceptance which may never come. The person lost that right and trust ….