No place like Vegas (Gambling Brainteaser Puzzle)

Las Vegas is the place for gambling in America. I was just coming out of a Casino when a man came up to me and said “I’ll bet you $5 that if you give me $10, I’ll give you $15.” What do you think I did?

Clue for the Puzzle:

What would be the result if he lost the bet?

Answer for the Puzzle:

I told him to go and look for another fool to try it on! If I had accepted his bet and given him the $10, he would simply have said “I lose the bet.” He would then have given me the $5 he had bet me. But I would have lost the other $5 through my stupidity.