'Replace' would be a strong word to use, I am sure this girl will always be in your heart..and if you want her to still be in your life...could you tell her just that, that you still want her to be in your life?

I found my friends changed often during school, and it was hard adjusting...you miss the old ones very bad, sometimes..but we learn and grow and it is sad but you do drift apart, if you let that happen..

School is hard, so many changes, in your own personality, in how you view yourself, and of course the changes in friendship, they hurt

How is everything else going in school/ at home?