What should I do about this situation? Academic paper

I am in the middle of a research project with the aim of publishing a paper. I have already began to write it up.
Me and my supervisor will be mentioned on the paper. Additionally, a girl I was interested in also expressed interest in being mentioned, and my supervisor did go behind my back and promise her a mention without consulting me.
Contribution wise, she contributed about 1% (sent me a program once), my supervisor about 19%, and I contributed 80%. I also contributed to her project, but never asked to be included in it.
Recently, I got a message from the girl who suggested that I am 'just for work' and should only write her exclusively questions about work. This had the effect of completely tearing apart my mental health.
I feel like she doesn't really deserve to be mentioned. I don't want to be spiteful or upset and actively try to distance myself from these emotions, but I just feel she doesn't really deserve to be mentioned as she barely did anything.
I feel even worse because she is going to be doing a master's project on exactly the same topic as I am doing right now.
Ultimately, whilst my supervisor can promise anyone she meets to be mentioned, the rules of our project made by the department clearly state that the student (me) has the final say in the project, including who to include as a co-author.
What should I do?

(edited 1 month ago)

Reply 1

mike23mike

Awkward. You dont want to annoy your supervisor. Best to have an honest discussion with your supervisor about your concerns that the other person has not made an equal contribution to the project so you have reservations about her being a co-author.