I'm going to be rude and cold to my 'friend'
What makes you want to be rude to him?
I want to pursue my dream of becoming an international spy
That dream should have nothing to do with being mean to your friend. you can be nice to him while also pursuing your dream.
I have to do this for my dream.
This is not something you have to do for your dream. Keep your friends at your side and do not mistreat them, it can come to bite you in the future.