I think I am going to lose a friend who is moving overseas
Why do you think you're going to lose this friend?
They need to be close to me in order for us to be friends.
You can have a friend from a different country. You can use that in the future if you decide to travel and your friend can show you around.
I need to be close to them so that I can borrow money.
I don't think you should only be friends with him to borrow money. That being said, you should just wait and see how you feel about your friendship once he goes overseas.