Hey guys. I am new here and I am having a problem with my girlfriend could really use some help and advice. The background: I'm 19 years and in my first semester of my second year of university. I was a shy, unconfident geek in high school but the summer after I graduated high school I discovered PUA which helped my gain confidence, be social and come out of my shell. I made tons of new friends and lost my virginity and gamed and went out with lots of girls. This all continued when I started university in the fall. I also got my first girlfriend, a girl who goes to the same school as me. Next week it will be our 1 year anniversary. Everything has been going great, but recently a problem came up which brings me to why I need help.
When we met my girlfriend had hair down to her collar bones. In the past year it has gotten longer and is down past her boobs. When she first added me on Facebook and I looked at her pictures in some she had short hair, like really short, like the actress from Harry Potter after she cut it. On one of our first dates I asked her about it and she told me that twice, when she was 15 and 17 she cut her hair off and donated it to make wigs for people with cancer. She also said she planning on doing it again in about a year. She told me the same thing when we became exclusive. At the time I didn't care because she was a HB who was interested in me and over this past year I have fallen in love with her and can see a long term future with her. However recently she mentioned that the time has come for her to cut her hair again and the appointment is scheduled for next week.
The thing is I do NOT want her to cut her hair. I don't like short hair on girls and to me it is not feminine. I have looked at the pictures of her with short hair and she does not look nearly as good as she does with long hair. When she brought up cutting it I commented on how much long hair suited her and how much I like it. She replied that I knew going in she was going to do this and she warned me a bunch of times before we were exclusive. If I'm not attracted to her it will affect our relationships negatively. Guys, I need help here. I want her to listen to me but I think if I just forbid her she will rebel even harder. I know women like men to lead and I always act alpha around her and I want her to take my feelings into account but I have no clue how to make her see that cutting it would be a mistake. This may seem like I'm being stupid but this is a big problem for me. I need to know what I can say or do to stop her from doing this. Thanks guys!