Yours is a very peculiar situation and based on what you have stated there was never a proper agreement between the two of you. Copies of the communication over WhatsApp and Facebook can be submitted as evidence but doesn’t hold the same value as a duly executed agreement. In my opinion the best course of action for you is have a legal notice served upon your friend for recovery of money as it is the logical first step and does not cost much. The amount of cost and efforts involved in suing him in a court of law might not be entirely justified considering that there are no concrete terms of investment. An amicable mode of settlement would be the optimal solution considering the facts of the case.
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