I ask him twice about our deal,
and after that i gave him the chance to correct his mistake and ill return the coins,
but his pride came up and just accuse me.
for now yeah, i cant stop you to believe what you want to believe,
the damage has been done already.
The only damage here is to your reputation. Either return his money, or pay him the Mrai you owe.
Many people ONLY see Mrai in the old wallet, so they didn't know there is a difference between Mrai and rai!
So even if you ask them if they are sure they want "rai", they won't know what you are talking about.
Put yourself in his shoes, would you want that to happen to you?
And it's not his pride, it's his money and you blatantly tricked him. In fact it is you, who is too proud and/or too greedy to correct this and move on, so we can have a good community. Enjoy your 0.16BTC and bad reputation.
At least how I see it.