Waheguroo Jee Ka Khalsa!
Waheguroo Jee Kee Fateh!!
The way I see it, is that your growing and your changing, and she cant accept it.
I went through a similar situation, where my g/f wanted to break up with me, b/c I told her I wanted to keep my hair. In the end it didnt work out, b/c we had different values and morals.
Do what you belive is right! Remember your beliefs and values!