Must:
My friend must trust me.
My friend must respect me.
My friend must spend with me a lot of time.
Mustn't:
My friend mustn't tell lies to me.
My friend mustn't walk without me.
My friend mustn't do unexpected things.
My friend should support me in difficult situations, be glad for my success. She should understand and respect me. I think, she shouldn't betray and envy me.
