1. Maybe there is a chance he will not pay back and doesn't want to **** you off.
2. The other person owes them a favor.
3. They don't want to owe you.
4. You need the money more and they know that.
Because of pride maybe.
well lets see. Will you take money from me? I will happily give it.
Maybe the receiver didn't have the need to. Maybe the giver was like a bank - offer money to people who don't need it
I give up!