How can he prove innocence? He confirms the first loan has been payed back. I have the TXID that shows that I sent him that money at HIS address the first time. And I have TXID with the two later transfers to THE SAME address.

If he says that it's not his address, then tell him to give you the TXID of the first (0.26) loan payback, with a message signed by his private key. He will not have it and he can't give it to you.

I have the evidence of my loan to him, while he sustained it was not true and that I'm trying to steal his bitcoins.