How do ask your friend to pay the money he borrowed from you?

Question

Some friends are pain on one's flesh. They would come and borrow money from you and do as if they never did, thereby putting you in a tight spot of having to ask for your money or forget about it and they won't pay you back. 

Comments

If they don't return the money, don't pay them the second time.

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Well, that's the best logical conclusion and the only choice left for you when they fail to pay back what they already borrowed. They should forget ever getting loaned money ever again. 

Answer 1

It is really needed to have them for the money they borrowed from you because it is your money but most of them we'll use that advantage to do something bad to you.