forgiveness in Islam

In 2010, I was prepared to make a cash injection into the partnership business so as to consider it a financial investment in the business and I was turned down.
During the last financial year, my partner asked me not to put money aside to share at the end of the year but to purchase stock instead. I did this. So the stock on the shelf is now worth far more than before.
In all this time, I was required to make some of my purchases from his main business, at a profit and benefit to him.