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It depends. I would probably ask him to pay me the money that he robbed from me. If things didn't went well according to my will (which is getting it) and his approach to me is not appropriate, I would get upset and chance is I will sue him.
Anyways, is this a true story? Where did you got it?
But how can you sue him in this case? You have no papers or other hard evidence showing you gave him money for the bet? I don't know the law on this aspect but a lawyer maybe can find a way how to get your share. Since he already ran away, it means, he has no intention of sharing the winnings to you. Better consult a lawyer how to proceed a case because they may have ideas on how to get your share from him.