My dear friend and landlord, you should have created a kind of tenancy agreement, nigerian landlord and tenants today are like cat and dogs, today they fight, tomorrow they become friends. I won't blame the young man actually but i disagree with the false allegations he placed against you. You have to place some money in your savings so that when tenancy complains arise, you'll be in a better position to fix them. Thank God you have learnt, treat your tenants next time as potential house owners, some don't leave in your compound because they don't have home. Work and businesses have scatter people far and wide. Goodluck