Who says that money matters could destroy a friendship? It is not true. You just have to be honest and be truthful. Money should not be an issue. It is actually not money that destroys a friendship but the broken trust.
When you are the one who is more blessed then be there to help. You should not think at all if it will be returned to you or not. That happens especially when you help your family members or those who are most dear to you. Once you lend help, it is help. Forget about it... If that person thinks of giving it back, then well and good. If not, then, you will not think about it anymore... Unconditional it is. It is also biblical, you know. Be not rewarded on this earth and God will be the One to reward you.
Sometimes, I really wish that I am rich so that I can help people close to me in bigger ways!